diff --git a/assets/scss/main.scss b/assets/scss/main.scss
index 6aeedde..2e00af6 100644
--- a/assets/scss/main.scss
+++ b/assets/scss/main.scss
@@ -1,5 +1,12 @@
 @import "theme.scss";
 @import "bootstrap/scss/bootstrap.scss";
+@import "maplibre-gl/dist/maplibre-gl.css";
+
+:root {
+  --ws-create-color: $review-create-color;
+  --ws-modify-color: $review-modify-color;
+  --ws-delete-color: $review-delete-color;
+}
 
 html, body, #__nuxt {
   width: 100%;
@@ -34,3 +41,28 @@ label > .form-select:first-child {
   width: 100%;
   height: 100%;
 }
+
+.dropdown-menu {
+  box-shadow: $box-shadow;
+}
+
+/* Review */
+
+.bg-create {
+  background-color: $review-create-color;
+}
+.bg-modify {
+  background-color: $review-modify-color;
+}
+.bg-delete {
+  background-color: $review-delete-color;
+}
+.text-create {
+  color: #{darken($review-create-color, 27%)};
+}
+.text-modify {
+  color: $review-modify-color;
+}
+.text-delete {
+  color: #{darken($review-delete-color, 3%)};
+}
diff --git a/assets/scss/theme.scss b/assets/scss/theme.scss
index 0ff4519..5df4fdf 100644
--- a/assets/scss/theme.scss
+++ b/assets/scss/theme.scss
@@ -10,3 +10,7 @@ $primary: #9b0092;
 @import "bootstrap/scss/mixins";
 
 $navbar-height: 58px;
+
+$review-create-color: #39dbc0;
+$review-modify-color: #db950a;
+$review-delete-color: #cc2c47;
diff --git a/components/AppIcon.vue b/components/AppIcon.vue
index 19c3b2f..0273716 100644
--- a/components/AppIcon.vue
+++ b/components/AppIcon.vue
@@ -30,6 +30,10 @@ const classes = computed(() => ([
 .material-icons {
   vertical-align: middle;
   margin-top: -3px;
+
+  &.me-2 {
+    margin-right: 0.33em !important;
+  }
 }
 .badge .material-icons {
   font-size: 1em;
@@ -37,7 +41,7 @@ const classes = computed(() => ([
   margin-top: 0;
 
   &.me-2 {
-    margin-right: 0.25rem !important;
+    margin-right: 0.25em !important;
   }
 }
 </style>
diff --git a/components/AppNavbar.vue b/components/AppNavbar.vue
index dfe5802..8266eeb 100644
--- a/components/AppNavbar.vue
+++ b/components/AppNavbar.vue
@@ -54,6 +54,8 @@ const auth = tdeiClient.auth
 
 <style>
 .app-navbar {
+  z-index: 900;
+
   .navbar-brand {
     display: inline-flex;
   }
diff --git a/components/AppPage.vue b/components/AppPage.vue
index a5fdb5a..6aa4a25 100644
--- a/components/AppPage.vue
+++ b/components/AppPage.vue
@@ -1,5 +1,20 @@
 <template>
-  <section class="container-lg py-4">
+  <section :class="classes">
     <slot />
   </section>
 </template>
+
+<script setup lang="ts">
+const props = defineProps({
+  fluid: {
+    type: Boolean,
+    default: false,
+  },
+});
+
+const classes = computed(() => ({
+  'py-4': true,
+  'container-fluid': props.fluid === true,
+  'container-lg': props.fluid === false,
+}));
+</script>
diff --git a/components/ChatBox.vue b/components/ChatBox.vue
new file mode 100644
index 0000000..e9c3689
--- /dev/null
+++ b/components/ChatBox.vue
@@ -0,0 +1,129 @@
+<template>
+  <div class="chat-box">
+    <div
+      v-if="!props.messages?.length"
+      class="empty-notice"
+    >
+      <app-icon
+        variant="chat"
+        size="36"
+      />
+      <span>{{ props.emptyText }}</span>
+    </div>
+    <ul
+      v-else
+      class="message-list"
+    >
+      <chat-box-message
+        v-for="message in props.messages"
+        :key="message.id"
+        v-bind="message"
+      />
+    </ul>
+
+    <form
+      class="input-group"
+      @submit.prevent="send"
+    >
+      <label class="flex-grow-1">
+        <span class="visually-hidden">Message</span>
+        <textarea
+          v-model="draft"
+          class="form-control"
+          placeholder="Type your message here"
+        />
+      </label>
+      <button
+        type="submit"
+        class="btn btn-light border"
+        title="Send"
+      >
+        <app-icon
+          variant="send"
+          no-margin
+        />
+        <span class="visually-hidden">Post Comment</span>
+      </button>
+    </form>
+  </div>
+</template>
+
+<script lang="ts">
+export interface ChatMessage {
+  id: PropertyKey;
+  date: Date;
+  user?: string;
+  text: string;
+}
+</script>
+
+<script setup lang="ts">
+interface Props {
+  messages: ChatMessage[];
+  emptyText?: string;
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  emptyText: 'Start a discussion…',
+});
+
+defineExpose({ clear });
+
+const emit = defineEmits(['send']);
+const draft = ref('');
+
+function send() {
+  emit('send', draft.value);
+}
+
+function clear() {
+  draft.value = '';
+}
+</script>
+
+<style lang="scss">
+.chat-box {
+  display: flex;
+  flex-direction: column;
+
+  .message-list {
+    list-style-type: none;
+    padding: 1rem;
+    margin: 0;
+    max-height: 30rem;
+    overflow: auto;
+  }
+
+  .empty-notice {
+    text-align: center;
+    padding: 5rem 1rem;
+    font-size: 1.5em;
+    font-weight: 300;
+
+    i {
+      opacity: 0.4;
+    }
+    span {
+      opacity: 0.65;
+    }
+  }
+
+  .message-list,
+  .empty-notice {
+    border-top: 1px solid var(--bs-border-color);
+    box-shadow: inset 0 0px 0.5rem rgba(0, 0, 0, 0.075);
+  }
+
+  .input-group {
+    * {
+      border-radius: 0;
+    }
+
+    textarea {
+      &:focus {
+        box-shadow: none;
+      }
+    }
+  }
+}
+</style>
diff --git a/components/ChatBoxMessage.vue b/components/ChatBoxMessage.vue
new file mode 100644
index 0000000..1c3d370
--- /dev/null
+++ b/components/ChatBoxMessage.vue
@@ -0,0 +1,64 @@
+<template>
+  <li class="chat-box-message">
+    <header>
+      <span class="visually-hidden">Comment by</span>
+      <span class="fw-bold">
+        <app-icon variant="account_circle" />{{ props.user ?? 'Anonymous' }}
+      </span>
+      <span :title="date">{{ elapsed }}</span>
+    </header>
+    <blockquote>{{ props.text }}</blockquote>
+  </li>
+</template>
+
+<script setup lang="ts">
+import { formatElapsed, formatShort } from '~/util/time';
+
+interface Props {
+  id: PropertyKey;
+  text: string;
+  user?: string;
+  date: Date;
+}
+
+const props = defineProps<Props>();
+const elapsed = computed(() => formatElapsed(props.date));
+const date = computed(() => formatShort(props.date));
+</script>
+
+<style lang="scss">
+.chat-box-message {
+  width: calc(100% - 1rem);
+  padding: 0.5rem;
+  margin-bottom: 1rem;
+  background: var(--bs-light);
+  border: 1px solid var(--bs-border-color);
+  border-radius: var(--bs-border-radius);
+  box-shadow: var(--bs-box-shadow-sm);
+
+  header {
+    display: flex;
+    justify-content: space-between;
+    margin-bottom: 1rem;
+  }
+
+  &:last-child {
+    margin: 0;
+  }
+
+  &.mine {
+    background: var(--bs-primary-bg-subtle);
+    border-color: var(--bs-primary-border-subtle);
+    margin-left: auto;
+
+    header {
+      text-align: right;
+    }
+  }
+
+  blockquote {
+    white-space: pre-line;
+    margin: 0;
+  }
+}
+</style>
diff --git a/components/dashboard/Toolbar.vue b/components/dashboard/Toolbar.vue
index 7f95fc9..76f788b 100644
--- a/components/dashboard/Toolbar.vue
+++ b/components/dashboard/Toolbar.vue
@@ -4,7 +4,18 @@
       <app-icon variant="edit_location_alt" size="24" />
       Edit
     </nuxt-link>
-    <div class="btn-group">
+    <div class="btn-group ms-1">
+      <nuxt-link
+        class="btn"
+        :to="reviewRoute"
+      >
+        <app-icon
+          variant="playlist_add_check"
+          size="24"
+          no-margin
+        />
+        <span class="d-none d-sm-inline ms-2">Review</span>
+      </nuxt-link>
       <!--
       <a :href="tasksHref" class="btn" target="_blank">
         <app-icon variant="checklist" size="24" />
@@ -12,14 +23,14 @@
       </a>
       -->
       <nuxt-link class="btn" :to="exportRoute" :aria-disabled="!workspace.center">
-        <app-icon variant="drive_folder_upload" size="24" />
-        <span class="d-none d-sm-inline">Export</span>
+        <app-icon variant="drive_folder_upload" size="24" no-margin />
+        <span class="d-none d-sm-inline ms-2">Export</span>
       </nuxt-link>
     </div>
     <div class="btn-group ms-auto">
       <nuxt-link class="btn" :to="settingsRoute">
-        <app-icon variant="settings" size="24" />
-        <span class="d-none d-sm-inline">Settings</span>
+        <app-icon variant="settings" size="24" no-margin />
+        <span class="d-none d-sm-inline ms-2">Settings</span>
       </nuxt-link>
     </div>
   </div>
@@ -49,6 +60,7 @@ const editRoute = computed(() => ({
   hash: editHash.value
 }));
 
+const reviewRoute = computed(() => workspacePath('review'));
 const exportRoute = computed(() => workspacePath('export'));
 const settingsRoute = computed(() => workspacePath('settings'));
 
diff --git a/components/review/AttributeDiff.vue b/components/review/AttributeDiff.vue
new file mode 100644
index 0000000..41d7d1c
--- /dev/null
+++ b/components/review/AttributeDiff.vue
@@ -0,0 +1,284 @@
+<template>
+  <section class="diff-attributes">
+    <header>
+      <app-icon :variant="elementIcon" />{{ elementType }}
+      <strong>#{{ elementId }}</strong>
+      {{ elementAction }} by
+      <strong>{{ props.diff.new.user }}</strong>
+    </header>
+
+    <div class="metadata-table-wrapper">
+      <table class="table table-sm table-striped">
+        <thead>
+          <tr>
+            <th />
+            <th v-if="props.diff.old">
+              Previous
+            </th>
+            <th>Current</th>
+          </tr>
+        </thead>
+        <tbody>
+          <tr
+            v-for="(value, key) in metadataDiff"
+            :key="key"
+          >
+            <th>{{ key }}</th>
+            <td v-if="props.diff.old">
+              {{ value.old }}
+            </td>
+            <td>{{ value.new }}</td>
+          </tr>
+        </tbody>
+      </table>
+    </div><!-- .metadata-table-wrapper -->
+
+    <div class="tag-table-wrapper">
+      <table class="table table-sm table-striped">
+        <thead>
+          <tr>
+            <th />
+            <th colspan="2">
+              Attribute
+            </th>
+            <th>Value</th>
+          </tr>
+        </thead>
+        <tbody>
+          <tr
+            v-for="[key, vals] in tagDiff"
+            :key="key"
+            :class="tagClass(vals)"
+          >
+            <th v-if="!vals.new">
+              -
+            </th>
+            <th v-else-if="!vals.old">
+              +
+            </th>
+            <th v-else-if="vals.new !== vals.old">
+              ~
+            </th>
+            <th v-else />
+            <th>{{ key }}</th>
+            <td>=</td>
+            <td v-if="!vals.new">
+              {{ vals.old }}
+            </td>
+            <td v-else-if="!vals.old || vals.old === vals.new">
+              {{ vals.new }}
+            </td>
+            <td v-else>
+              <span class="text-delete">{{ vals.old }}</span>
+              &rarr;
+              <span class="text-create">{{ vals.new }}</span>
+            </td>
+          </tr>
+        </tbody>
+      </table>
+    </div><!-- .tag-table-wrapper -->
+  </section>
+</template>
+
+<script lang="ts">
+</script>
+
+<script setup lang="ts">
+import { formatShort } from '~/util/time';
+import type { AdiffAction } from '~/types/adiff';
+import type { WorkspaceType } from '~/types/workspaces';
+
+const displayTypeMap = {
+  osw: {
+    node: 'Node',
+    way: 'Edge',
+    relation: 'Relation',
+  },
+  pathways: {
+    node: 'Stop',
+    way: 'Pathway',
+    relation: 'Relation',
+  },
+};
+
+const displayActionMap = {
+  create: 'created',
+  modify: 'modified',
+  delete: 'deleted',
+};
+
+const elementIconMap = {
+  create: 'add_circle_outline',
+  modify: 'change_circle',
+  delete: 'cancel',
+};
+
+interface TagMapItem {
+  old: string | undefined;
+  new: string | undefined;
+}
+
+class TagMap {
+  #map: Map<string, TagMapItem>;
+
+  constructor() {
+    this.#map = new Map();
+  }
+
+  getTag(tag: string) {
+    let entry = this.#map.get(tag);
+
+    if (!entry) {
+      entry = { old: '', new: '' };
+      this.#map.set(tag, entry);
+    }
+
+    return entry;
+  }
+
+  toArray() {
+    return [...this.#map.entries()].sort((a, b) => a[0].localeCompare(b[0]));
+  }
+}
+
+interface Props {
+  datasetType: WorkspaceType;
+  diff: AdiffAction;
+}
+
+const props = defineProps<Props>();
+
+const elementId = computed(() => props.diff.new?.id ?? props.diff.old?.id);
+const elementType = computed(() => {
+  const map = displayTypeMap[props.datasetType] ?? displayTypeMap.osw;
+  const featureType = props.diff.new?.type ?? props.diff.old?.type;
+
+  return map[featureType];
+});
+const elementAction = computed(() => displayActionMap[props.diff.type]);
+const elementIcon = computed(() => elementIconMap[props.diff.type]);
+
+const metadataDiff = computed(() => ({
+  version: {
+    old: props.diff.old?.version,
+    new: props.diff.new.version,
+  },
+  timestamp: {
+    old: props.diff.old ? formatShort(new Date(props.diff.old.timestamp)) : undefined,
+    new: formatShort(new Date(props.diff.new.timestamp)),
+  },
+  changeset: {
+    old: props.diff.old?.changeset,
+    new: props.diff.new.changeset,
+  },
+  username: {
+    old: props.diff.old?.user,
+    new: props.diff.new.user,
+  },
+}));
+
+const tagDiff = computed(() => {
+  const tagMap = new TagMap();
+
+  if (props.diff.old) {
+    for (const key in props.diff.old.tags) {
+      tagMap.getTag(key).old = props.diff.old.tags[key];
+    }
+  }
+
+  for (const key in props.diff.new.tags) {
+    tagMap.getTag(key).new = props.diff.new.tags[key];
+  }
+
+  return tagMap.toArray();
+});
+
+function tagClass(vals: TagMapItem) {
+  if (!vals.old) {
+    return 'table-success';
+  }
+  if (!vals.new) {
+    return 'table-danger';
+  }
+  if (vals.old !== vals.new) {
+    return 'table-warning';
+  }
+}
+</script>
+
+<style lang="scss">
+@import "assets/scss/theme.scss";
+
+.diff-attributes {
+  position: absolute;
+  min-width: 25rem;
+  max-width: 50%;
+  bottom: 2rem;
+  right: 0.6rem;
+  overflow: hidden;
+  font-size: 0.875em;
+
+  > * {
+    background: var(--bs-body-bg);
+    box-shadow: var(--bs-box-shadow);
+    border-radius: var(--bs-border-radius);
+    margin-bottom: 0.5rem;
+  }
+
+  header {
+    padding: 0.25em 0.5em;
+  }
+
+  table {
+    margin: 0;
+  }
+
+  tbody th {
+    font-weight: normal;
+  }
+
+  th, td {
+    line-height: 1;
+  }
+
+  th:first-child {
+    padding-left: 0.5em;
+  }
+
+  .metadata-table-wrapper,
+  .tag-table-wrapper {
+    max-height: calc(70vh - $navbar-height - 5rem);
+    overflow: auto;
+  }
+
+  .metadata-table-wrapper th:first-child {
+    text-transform: capitalize;
+  }
+
+  .tag-table-wrapper tbody {
+    font-family: monospace;
+  }
+
+  .table-success {
+    --bs-table-bg: #{lighten($review-create-color, 35%)};
+    --bs-table-striped-bg: #{lighten($review-create-color, 31%)};
+    --bs-table-border-color: #{lighten($review-create-color, 20%)};
+    --bs-table-color: #{darken($review-create-color, 32%)};
+    --bs-table-striped-color: #{darken($review-create-color, 30%)};
+  }
+  .table-warning {
+    --bs-table-bg: #{lighten($review-modify-color, 46%)};
+    --bs-table-striped-bg: #{lighten($review-modify-color, 43%)};
+    --bs-table-border-color: #{lighten($review-modify-color, 30%)};
+    --bs-table-color: #{darken($review-modify-color, 22%)};
+    --bs-table-striped-color: #{darken($review-modify-color, 20%)};
+  }
+  .table-danger {
+    --bs-table-bg: #{lighten($review-delete-color, 40%)};
+    --bs-table-striped-bg: #{lighten($review-delete-color, 35%)};
+    --bs-table-border-color: #{lighten($review-delete-color, 32%)};
+    --bs-table-color: #{darken($review-delete-color, 10%)};
+    --bs-table-striped-color: #{darken($review-delete-color, 15%)};
+  }
+}
+</style>
diff --git a/components/review/ChangesBadge.vue b/components/review/ChangesBadge.vue
new file mode 100644
index 0000000..88b5d5c
--- /dev/null
+++ b/components/review/ChangesBadge.vue
@@ -0,0 +1,92 @@
+<template>
+  <span
+    class="changes-badge"
+    :class="{ loading: props.loading }"
+  >
+    <span :class="createClasses">
+      {{ props.create }}
+      <span class="visually-hidden">elements created</span>
+    </span>
+    <span :class="modifyClasses">
+      {{ props.modify }}
+      <span class="visually-hidden">elements modified</span>
+    </span>
+    <span :class="deleteClasses">
+      {{ props.delete }}
+      <span class="visually-hidden">elements deleted</span>
+    </span>
+    <span class="loading-overlay">
+      <span class="visually-hidden">Loading&hellip;</span>
+    </span>
+  </span>
+</template>
+
+<script setup lang="ts">
+interface Props {
+  create: number;
+  modify: number;
+  delete: number;
+  loading: boolean | undefined;
+}
+
+const props = defineProps<Props>();
+
+const createClasses = computed(() => ([
+  'badge',
+  props.create > 0 ? 'bg-create' : undefined,
+]));
+const modifyClasses = computed(() => ([
+  'badge',
+  props.modify > 0 ? 'bg-modify' : undefined,
+]));
+const deleteClasses = computed(() => ([
+  'badge',
+  props.delete > 0 ? 'bg-delete' : undefined,
+]));
+</script>
+
+<style lang="scss">
+.changes-badge {
+  display: flex;
+  position: relative;
+  color: white;
+  background-color: #999999;
+  border-radius: var(--bs-border-radius);
+  overflow: hidden;
+  font-size: 1rem;
+  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.6);
+
+  &.loading {
+    .badge {
+      visibility: hidden;
+    }
+    .loading-overlay {
+      display: inline;
+    }
+  }
+
+  .badge {
+    border-radius: 0;
+  }
+
+  .loading-overlay {
+    display: none;
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+    background: rgba(0, 0, 0, 0.12);
+    animation: changes-badge-loading-animation 1s linear infinite;
+  }
+}
+
+@keyframes changes-badge-loading-animation {
+  from {
+    transform: translateX(-100%);
+  }
+  to {
+    transform: translateX(100%);
+  }
+}
+</style>
diff --git a/components/review/ChangesetDetails.vue b/components/review/ChangesetDetails.vue
new file mode 100644
index 0000000..72caf03
--- /dev/null
+++ b/components/review/ChangesetDetails.vue
@@ -0,0 +1,71 @@
+<template>
+  <section class="review-changeset-details">
+    <header>
+      <h4 class="h5">
+        Details
+      </h4>
+    </header>
+
+    <table class="table table-sm table-striped">
+      <tbody>
+        <tr
+          v-for="(value, key) in metadata"
+          :key="key"
+        >
+          <th>{{ key }}</th>
+          <td>{{ value }}</td>
+        </tr>
+      </tbody>
+    </table>
+  </section>
+</template>
+
+<script setup lang="ts">
+import { formatShort } from '~/util/time';
+
+const props = defineProps({
+  changeset: {
+    type: Object,
+    required: true,
+  },
+});
+
+const metadata = computed(() => ({
+  comment: props.changeset.tags?.comment,
+  created_by: props.changeset.tags?.created_by,
+  imagery_used: props.changeset.tags?.imagery_used,
+  user: props.changeset.user,
+  uid: props.changeset.uid,
+  created_at: formatShort(props.changeset.created_at),
+  closed_at: formatShort(props.changeset.closed_at),
+}));
+</script>
+
+<style lang="scss">
+@import "assets/scss/theme.scss";
+
+.review-changeset-details {
+  position: absolute;
+  top: 5.5rem;
+  left: 1rem;
+  background: var(--bs-body-bg);
+  max-width: calc(100% - 1.5rem);
+  max-height: calc(90vh - $navbar-height - 6rem);
+  border-radius: var(--bs-border-radius);
+  overflow: auto;
+  font-size: 0.875em;
+  box-shadow: var(--bs-box-shadow);
+
+  header {
+    padding: 0.5rem;
+  }
+
+  table, h4 {
+    margin: 0;
+  }
+
+  th, td {
+    padding: 0.25em 0.5em;
+  }
+}
+</style>
diff --git a/components/review/Details.vue b/components/review/Details.vue
new file mode 100644
index 0000000..adde49a
--- /dev/null
+++ b/components/review/Details.vue
@@ -0,0 +1,98 @@
+<template>
+  <section class="review-details">
+    <header>
+      <h4 class="h5">
+        Details
+      </h4>
+    </header>
+
+    <table class="table table-sm table-striped">
+      <tbody>
+        <tr
+          v-for="(value, key) in metadata"
+          :key="key"
+        >
+          <th>{{ key }}</th>
+          <td>{{ value }}</td>
+        </tr>
+      </tbody>
+    </table>
+  </section>
+</template>
+
+<script setup lang="ts">
+import type { ReviewListItem } from '~/services/review';
+import { formatShort } from '~/util/time';
+
+import type { OsmChangeset, OsmNote } from '~/types/osm';
+import type { TdeiFeedback } from '~/types/tdei';
+
+interface Props {
+  item: ReviewListItem;
+}
+
+const props = defineProps<Props>();
+
+const getChangesetMetadata = (changeset: OsmChangeset) => ({
+  'Comment': changeset.tags?.comment,
+  'Editor': changeset.tags?.created_by,
+  'Source': changeset.tags?.source,
+  'Imagery': changeset.tags?.imagery_used,
+  'Created By': changeset.user,
+  'User ID': changeset.uid,
+  'Created At': formatShort(changeset.created_at),
+  'Closed At': formatShort(changeset.closed_at),
+});
+const getFeedbackMetadata = (feedback: TdeiFeedback) => ({
+  'TDEI Dataset': feedback.dataset?.name,
+  'TDEI Project Group': feedback.project_group?.name,
+  'Contact E-mail Address': feedback.customer_email,
+  'Due Date': formatShort(feedback.due_date),
+  'Created At': formatShort(feedback.created_at),
+  'Updated At': formatShort(feedback.updated_at),
+  'Status': feedback.status,
+  'Resolution Status': feedback.resolution_status,
+  'Resolution': feedback.resolution_description,
+  'Resolved By': feedback.resolved_by,
+});
+const getNoteMetadata = (note: OsmNote) => ({
+  'Created By': note.comments[0]?.user ?? 'Anonymous',
+  'Created At': formatShort(note.created_at),
+  'Status': note.status,
+});
+const metadata = computed(() => {
+  if (props.item.isChangeset) {
+    return getChangesetMetadata(props.item.data as OsmChangeset);
+  }
+  if (props.item.isFeedback) {
+    return getFeedbackMetadata(props.item.data as TdeiFeedback);
+  }
+  if (props.item.isNote) {
+    return getNoteMetadata(props.item.data as OsmNote);
+  }
+
+  return { };
+});
+</script>
+
+<style lang="scss">
+.review-details {
+  background: var(--bs-body-bg);
+  border-radius: var(--bs-border-radius);
+  font-size: 0.875em;
+  overflow: hidden;
+  box-shadow: var(--bs-box-shadow);
+
+  header {
+    padding: 0.5rem;
+  }
+
+  table, h4 {
+    margin: 0;
+  }
+
+  th, td {
+    padding: 0.25em 0.5em;
+  }
+}
+</style>
diff --git a/components/review/Discussion.vue b/components/review/Discussion.vue
new file mode 100644
index 0000000..ca8789d
--- /dev/null
+++ b/components/review/Discussion.vue
@@ -0,0 +1,115 @@
+<template>
+  <section class="review-discussion">
+    <header>
+      <h4 class="h5">
+        Discussion
+      </h4>
+    </header>
+
+    <app-spinner v-show="loading" />
+    <chat-box
+      v-show="!loading"
+      ref="chat"
+      :messages="messages"
+      @send="send"
+    />
+  </section>
+</template>
+
+<script setup lang="ts">
+import type { ReviewListItem } from '~/services/review';
+import { osmClient } from '~/services/index';
+
+import type ChatBox from '~/components/ChatBox.vue';
+import type { ChatMessage } from '~/components/ChatBox.vue';
+import type { OsmNote } from '~/types/osm';
+
+interface Props {
+  item: ReviewListItem;
+}
+
+const props = defineProps<Props>();
+
+const route = useRoute();
+const workspaceId = Number(route.params.id);
+
+const loading = ref(false);
+const messages = ref<ChatMessage[]>([]);
+const chat = useTemplateRef<InstanceType<typeof ChatBox>>('chat');
+
+refresh();
+
+async function refresh() {
+  loading.value = true;
+
+  if (props.item.isChangeset) {
+    await refreshChangeset();
+  }
+  else if (props.item.isNote) {
+    refreshNote();
+  }
+
+  loading.value = false;
+}
+
+async function refreshChangeset() {
+  if (!props.item.hasComments) {
+    messages.value = [];
+    return;
+  }
+
+  messages.value = await osmClient.getChangesetComments(workspaceId, props.item.id);
+}
+
+function refreshNote() {
+  messages.value = (props.item.data as OsmNote).comments.map(comment => ({
+    id: Symbol(),
+    user: comment.user,
+    date: comment.date,
+    text: comment.text,
+  }));
+}
+
+async function send(message: string) {
+  if (props.item.isChangeset) {
+    await sendChangeset(message);
+  }
+
+  chat.value?.clear();
+}
+
+async function sendChangeset(message: string) {
+  await osmClient.postChangesetComment(workspaceId, props.item.id, message);
+}
+</script>
+
+<style lang="scss">
+@import "assets/scss/theme.scss";
+
+.review-discussion {
+  background: var(--bs-body-bg);
+  max-width: 25rem;
+  max-height: calc(100vh - $navbar-height - 7rem);
+  border-radius: var(--bs-border-radius);
+  font-size: 0.875em;
+  box-shadow: var(--bs-box-shadow);
+  overflow: hidden;
+
+  > header {
+    padding: 0.5rem;
+
+    h4 {
+      margin: 0;
+    }
+  }
+
+  > .spinner-border {
+    display: block;
+    margin: 5rem auto;
+  }
+
+  .chat-box {
+    max-height: calc(100vh - $navbar-height - 7rem - 2.5rem);
+  }
+}
+</style>
diff --git a/components/review/FilterDropdown.vue b/components/review/FilterDropdown.vue
new file mode 100644
index 0000000..1c89542
--- /dev/null
+++ b/components/review/FilterDropdown.vue
@@ -0,0 +1,82 @@
+<template>
+  <div class="dropdown ms-auto">
+    <button
+      id="reviewSettingsBtn"
+      type="button"
+      class="btn btn-light btn-sm border"
+      data-bs-toggle="dropdown"
+      aria-haspopup="true"
+      aria-expanded="false"
+    >
+      <app-icon variant="settings" no-margin />
+      <span class="visually-hidden">Settings</span>
+    </button>
+
+    <div class="dropdown-menu dropdown-menu-end" aria-labelledby="reviewSettingsBtn">
+      <div class="px-3 py-2">
+        <div class="form-check form-switch">
+          <label class="form-check-label">
+            <input
+              v-model="filter.includeChangesets"
+              type="checkbox"
+              class="form-check-input"
+            />
+            Changesets
+          </label>
+        </div>
+        <div class="form-check form-switch">
+          <label class="form-check-label">
+            <input
+              v-model="filter.includeFeedback"
+              type="checkbox"
+              class="form-check-input"
+            />
+            Feedback
+          </label>
+        </div>
+        <div class="form-check form-switch">
+          <label class="form-check-label">
+            <input
+              v-model="filter.includeNotes"
+              type="checkbox"
+              class="form-check-input"
+            />
+            Notes
+          </label>
+        </div>
+      </div>
+
+      <div class="dropdown-divider" />
+
+      <div class="px-3 py-2">
+        <div class="form-check form-switch">
+          <label class="form-check-label">
+            <input
+              v-model="filter.includeResolved"
+              type="checkbox"
+              class="form-check-input"
+            />
+            Show Resolved
+          </label>
+        </div>
+      </div>
+
+      <div class="dropdown-divider" />
+
+      <div class="px-3 py-2">
+        <button class="d-block btn btn-primary btn-sm" @click="apply">Apply</button>
+      </div>
+    </div><!-- .dropdown-menu -->
+  </div><!-- .dropdown -->
+</template>
+
+<script setup lang="ts">
+import type { ReviewListFilter } from '~/services/review';
+
+const filter = defineModel<ReviewListFilter>({ required: true });
+const emit = defineEmits(['apply']);
+
+function apply() {
+  emit('apply');
+}
+</script>
diff --git a/components/review/Item.vue b/components/review/Item.vue
new file mode 100644
index 0000000..c470c73
--- /dev/null
+++ b/components/review/Item.vue
@@ -0,0 +1,147 @@
+<template>
+  <button
+    ref="el"
+    :class="classes"
+  >
+    <div class="review-item-top">
+      <span>
+        <span
+          class="badge"
+          :class="props.item.badgeClass"
+        >
+          <app-icon :variant="props.item.badgeIcon" />
+          {{ props.item.displayType }}
+        </span>
+        <span class="ms-2">#{{ props.item.id }}</span>
+        <span
+          v-if="props.item.isResolved"
+          class="badge bg-success mx-2"
+        >
+          Resolved
+        </span>
+      </span>
+      <span :class="elapsedClasses">
+        <app-icon
+          v-if="props.item.feedbackOverdue"
+          variant="error_outline"
+          class="overdue-icon"
+          no-margin
+        />
+        {{ elapsed }}
+      </span>
+    </div>
+
+    <div class="review-item-middle">
+      {{ props.item.title }}
+    </div>
+
+    <div class="review-item-bottom">
+      <span>
+        <app-icon variant="account_box" />{{ props.item.displayName }}
+      </span>
+
+      <span
+        v-if="props.item.hasComments"
+        class="ms-auto me-3"
+      >
+        <app-icon variant="chat" />{{ props.item.commentCount }}
+      </span>
+      <review-changes-badge
+        v-if="props.item.isChangeset"
+        v-bind="props.item.changesetCounts"
+        :loading="props.item.loadingChangeset"
+      />
+    </div>
+  </button>
+</template>
+
+<script lang="ts">
+// Associate the DOM element with this item to carry it to the observer
+// callback so we can load the changeset OSC:
+//
+</script>
+
+<script setup lang="ts">
+import type { ReviewListItem } from '~/services/review';
+import { formatElapsed } from '~/util/time';
+
+export type ItemElement = HTMLButtonElement & { wsReviewItem: ReviewListItem };
+
+interface Props {
+  item: ReviewListItem;
+  selected: boolean;
+  changesetObserver: IntersectionObserver;
+}
+
+const props = defineProps<Props>();
+const el = useTemplateRef<ItemElement>('el');
+
+const classes = computed(() => ({
+  'review-item': true,
+  'list-group-item': true,
+  'list-group-item-action': true,
+  'active': props.selected,
+}));
+const elapsed = computed(() => formatElapsed(props.item.data.created_at));
+const elapsedClasses = computed(() => ({
+  'text-danger': props.item.feedbackOverdue,
+}));
+
+if (props.item.isChangeset) {
+  onMounted(() => {
+    if (el.value) {
+      // Associate the DOM element with this item to carry it to the observer
+      // callback so we can load the changeset OSC:
+      //
+      el.value.wsReviewItem = props.item;
+
+      props.changesetObserver.observe(el.value);
+    }
+  });
+}
+</script>
+
+<style lang="scss">
+.review-item.list-group-item {
+  cursor: pointer;
+  border-left: none;
+  border-right: none;
+  border-radius: 0;
+
+  .badge {
+    text-transform: uppercase;
+  }
+}
+
+.review-item-top {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  font-size: 0.8em;
+
+  .overdue-icon {
+    font-size: 16px;
+  }
+}
+
+.review-item-middle {
+  margin-top: 0.5rem;
+
+  /* Truncate to 3 lines: */
+  overflow: hidden;
+  display: -webkit-box;
+  line-clamp: 3;
+  -webkit-line-clamp: 3;
+  -webkit-box-orient: vertical;
+
+  /* Fallback for line-clamp: */
+  max-height: 4.5em;
+}
+
+.review-item-bottom {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  font-size: 0.9em;
+}
+</style>
diff --git a/components/review/Map.vue b/components/review/Map.vue
new file mode 100644
index 0000000..770e0fa
--- /dev/null
+++ b/components/review/Map.vue
@@ -0,0 +1,210 @@
+<template>
+  <div
+    ref="map"
+    class="review-map"
+  />
+</template>
+
+<script lang="ts">
+import type { StyleSpecification } from 'maplibre-gl';
+</script>
+
+<script setup lang="ts">
+import maplibregl from 'maplibre-gl';
+import { MapLibreAugmentedDiffViewer } from '@osmcha/maplibre-adiff-viewer';
+
+import { changesetManager } from '~/services/index';
+import type { ReviewListItem } from '~/services/review';
+
+import type { AdiffAction } from '~/types/adiff';
+import type { OsmChangeset, OsmNote } from '~/types/osm';
+import type { TdeiFeedback } from '~/types/tdei';
+// const reviewMapStyle = {
+//   'version': 8,
+//  'sources': {
+//     'osm': {
+//      'type': 'raster',
+//      'tiles': ['https://a.tile.openstreetmap.org/{z}/{x}/{y}.png'],
+//      'tileSize': 256,
+//       'attribution': '&copy; OpenStreetMap Contributors',
+//       'maxzoom': 19
+//     }
+//   },
+//   'layers': [
+//     {
+//       'id': 'osm',
+//       'type': 'raster',
+//       'source': 'osm'
+//     }
+//   ]
+// };
+
+const reviewMapStyle: StyleSpecification = {
+  version: 8,
+  sources: {
+    bing: {
+      type: 'raster',
+      scheme: 'xyz',
+      tiles: [
+        'https://ecn.t0.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=587&mkt=en-gb&n=z',
+        'https://ecn.t1.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=587&mkt=en-gb&n=z',
+        'https://ecn.t2.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=587&mkt=en-gb&n=z',
+        'https://ecn.t3.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=587&mkt=en-gb&n=z',
+      ],
+      tileSize: 256,
+      maxzoom: 20,
+      attribution: 'Imagery © Microsoft Corporation',
+    },
+  },
+  layers: [
+    {
+      id: 'imagery',
+      type: 'raster',
+      source: 'bing',
+    },
+  ],
+};
+
+interface Props {
+  workspaceId: number;
+  item?: ReviewListItem;
+}
+
+const props = defineProps<Props>();
+
+defineExpose({ getLatLonZoom });
+
+const loading = defineModel<boolean>('loading');
+const currentDiff = defineModel<AdiffAction>('currentDiff');
+const mapRef = useTemplateRef<HTMLDivElement>('map');
+
+let reviewMap: maplibregl.Map;
+let adiffViewer: typeof MapLibreAugmentedDiffViewer;
+let popup: maplibregl.Popup;
+
+onMounted(() => {
+  initMap();
+});
+watch(() => props.item, drawItem);
+
+function initMap() {
+  if (reviewMap) {
+    reviewMap.remove();
+  }
+
+  if (mapRef.value) {
+    reviewMap = new maplibregl.Map({
+      container: mapRef.value,
+      style: reviewMapStyle,
+    });
+  }
+}
+
+function resetMap() {
+  reviewMap.setStyle(reviewMapStyle);
+
+  if (popup) {
+    popup.remove();
+  }
+}
+
+function getLatLonZoom() {
+  const { lng, lat } = reviewMap.getCenter();
+  const zoom = reviewMap.getZoom();
+
+  return { lat, lon: lng, zoom };
+}
+
+async function drawItem(item: ReviewListItem | undefined) {
+  if (!item) {
+    return;
+  }
+
+  loading.value = true;
+
+  if (item.isChangeset) {
+    if (item.loadingChangeset) {
+      await item.oscPromise;
+    }
+
+    await drawChangeset(item.data as OsmChangeset);
+  }
+  else if (item.isFeedback) {
+    drawFeedback(item.data as TdeiFeedback);
+  }
+  else if (item.isNote) {
+    drawNote(item.data as OsmNote);
+  }
+
+  loading.value = false;
+}
+
+async function drawChangeset(changeset: OsmChangeset) {
+  const adiff = await changesetManager.getAdiff(props.workspaceId, changeset);
+  resetMap();
+
+  adiffViewer = new MapLibreAugmentedDiffViewer(adiff, {
+    onClick: onAdiffClick,
+    showElements: ['node', 'way', 'relation'],
+    showActions: ['create', 'modify', 'delete', 'noop'],
+  });
+
+  adiffViewer.addTo(reviewMap);
+
+  const czb = reviewMap.cameraForBounds(adiffViewer.bounds(), {
+    padding: 200,
+    maxZoom: 18,
+  });
+
+  if (czb) {
+    reviewMap.jumpTo(czb);
+  }
+}
+
+function drawFeedback(feedback: TdeiFeedback) {
+  resetMap();
+
+  popup = new maplibregl.Popup({ closeButton: false, closeOnClick: false })
+    .setLngLat([feedback.location_longitude, feedback.location_latitude])
+    .setText(feedback.feedback_text)
+    .addTo(reviewMap);
+
+  reviewMap.jumpTo({
+    center: [feedback.location_longitude, feedback.location_latitude],
+    zoom: 18,
+  });
+}
+
+function drawNote(note: OsmNote) {
+  resetMap();
+
+  popup = new maplibregl.Popup({ closeButton: false, closeOnClick: false })
+    .setLngLat([note.lon, note.lat])
+    .setText(note.comments[0]?.text ?? '(empty)')
+    .addTo(reviewMap);
+
+  reviewMap.jumpTo({
+    center: [note.lon, note.lat],
+    zoom: 18,
+  });
+}
+
+function onAdiffClick(_event: object, action: AdiffAction) {
+  if (action) {
+    const element = action.new ?? action.old;
+    adiffViewer.select(element.type, element.id);
+    currentDiff.value = action;
+  }
+  else {
+    currentDiff.value = undefined;
+    adiffViewer.deselect();
+  }
+}
+</script>
+
+<style lang="scss">
+.review-map {
+  width: 100%;
+  height: 100%;
+}
+</style>
diff --git a/components/review/Overlay.vue b/components/review/Overlay.vue
new file mode 100644
index 0000000..cb2c57a
--- /dev/null
+++ b/components/review/Overlay.vue
@@ -0,0 +1,61 @@
+<template>
+  <section class="review-overlay">
+    <review-toolbar
+      v-model:show-details="showDetails"
+      v-model:show-discussion="showDiscussion"
+      :item="item"
+      @edit="props.onEdit"
+    />
+
+    <div class="review-overlay-panels">
+      <review-details
+        v-if="showDetails"
+        :item="item"
+      />
+      <review-discussion
+        v-if="showDiscussion"
+        :item="item"
+      />
+    </div>
+  </section>
+</template>
+
+<script setup lang="ts">
+import type { ReviewListItem } from '~/services/review';
+
+interface Props {
+  item: ReviewListItem;
+  onEdit: () => void;
+}
+
+const props = defineProps<Props>();
+
+const showDetails = ref(false);
+const showDiscussion = ref(false);
+
+watch(() => props.item, () => {
+  showDetails.value = false;
+  showDiscussion.value = false;
+});
+</script>
+
+<style lang="scss">
+@import "assets/scss/theme.scss";
+
+.review-overlay {
+  position: absolute;
+  top: 1rem;
+  left: 1rem;
+  margin-right: 1rem;
+
+  .review-overlay-panels {
+    max-height: calc(100vh - $navbar-height - 6rem);
+    overflow: auto;
+    box-shadow: var(--bs-box-shadow);
+
+    & > :not(:last-child) {
+      margin-bottom: 0.5rem;
+    }
+  }
+}
+</style>
diff --git a/components/review/Sidebar.vue b/components/review/Sidebar.vue
new file mode 100644
index 0000000..958d619
--- /dev/null
+++ b/components/review/Sidebar.vue
@@ -0,0 +1,150 @@
+<template>
+  <section class="review-sidebar">
+    <header class="border-top">
+      <h2 class="h5">
+        Reviewing Workspace
+      </h2>
+      <review-filter-dropdown
+        v-model="filter"
+        @apply="refresh"
+      />
+    </header>
+
+    <header class="border-top border-bottom">
+      <h3>{{ props.reviewList.workspace?.title }}</h3>
+      <button
+        class="btn btn-light btn-sm border ms-auto"
+        @click="refresh"
+      >
+        <app-icon
+          variant="refresh"
+          no-margin
+        />
+        <span class="visually-hidden">Refresh</span>
+      </button>
+    </header>
+
+    <div
+      ref="reviewListGroup"
+      class="list-group"
+    >
+      <app-spinner v-if="loading" />
+      <review-item
+        v-for="item in items"
+        :key="item.key"
+        :item="item"
+        :changeset-observer="changesetObserver"
+        :selected="item === currentItem"
+        @click="currentItem = item"
+      />
+    </div>
+  </section><!-- .review-sidebar -->
+</template>
+
+<script setup lang="ts">
+import type { ItemElement } from '~/components/review/Item.vue';
+import type {
+  ReviewList,
+  ReviewListFilter,
+  ReviewListItem,
+} from '~/services/review';
+
+interface Props {
+  reviewList: ReviewList;
+  loading: boolean;
+}
+
+const props = defineProps<Props>();
+const emit = defineEmits(['refresh']);
+const currentItem = defineModel<ReviewListItem>('item');
+const filter = defineModel<ReviewListFilter>('filter', { required: true });
+const reviewListGroup = useTemplateRef<HTMLDivElement>('reviewListGroup');
+const items = reactive(props.reviewList.items);
+
+let changesetObserver: IntersectionObserver;
+
+onMounted(() => {
+  // We load some additional data when a changeset item scrolls into view:
+  changesetObserver = new IntersectionObserver(
+    onChangesetObserved,
+    {
+      root: reviewListGroup.value,
+      threshold: 0.2,
+    },
+  );
+});
+
+onUnmounted(() => {
+  if (changesetObserver) {
+    changesetObserver.disconnect();
+  }
+});
+
+function onChangesetObserved(entries: IntersectionObserverEntry[]) {
+  for (const entry of entries) {
+    if (entry.isIntersecting) {
+      const target = entry.target as ItemElement;
+      changesetObserver.unobserve(target);
+      props.reviewList.loadOsmChange(target.wsReviewItem);
+    }
+  }
+}
+
+function refresh() {
+  emit('refresh');
+}
+</script>
+
+<style lang="scss">
+.review-sidebar {
+  display: flex;
+  flex-direction: column;
+  background-color: var(--bs-body-bg);
+  flex-basis: 25%;
+  min-width: 22rem;
+  max-width: 35rem;
+  box-shadow: var(--bs-box-shadow);
+  z-index: 901;
+
+  header {
+    display: flex;
+    align-items: center;
+    padding: 0.5rem 1rem;
+
+    h2 {
+      margin: 0;
+    }
+    h3 {
+      display: block;
+      font-size: 1rem;
+      margin-bottom: 0;
+      overflow: hidden;
+      white-space: nowrap;
+      text-overflow: ellipsis;
+    }
+  }
+
+  label {
+    white-space: nowrap;
+  }
+
+  .list-group {
+    position: relative;
+    overflow: auto;
+    flex-grow: 1;
+
+    .spinner-border {
+      position: absolute;
+      top: calc(50% - 1rem);
+      left: 0;
+      right: 0;
+      margin: 0 auto;
+    }
+  }
+
+  .list-group-item:first-child {
+    border-top: 0;
+    border-radius: 0;
+  }
+}
+</style>
diff --git a/components/review/Toolbar.vue b/components/review/Toolbar.vue
new file mode 100644
index 0000000..98edf75
--- /dev/null
+++ b/components/review/Toolbar.vue
@@ -0,0 +1,96 @@
+<template>
+  <nav class="review-toolbar">
+    <span class="border-end pe-3 me-3 text-uppercase ">
+      <span class="fw-bold">{{ props.item.displayType }}:</span>
+      #{{ props.item.id }}
+    </span>
+    <button
+      class="btn btn-sm btn-dark"
+      @click="edit"
+    >
+      <app-icon
+        variant="edit_location_alt"
+        no-margin
+      />
+      <span class="d-none d-sm-inline ms-2">Edit Here</span>
+    </button>
+    <button
+      class="btn btn-sm btn-light border ms-2"
+      :class="{ active: showDetails }"
+      aria-haspopup="true"
+      :aria-expanded="showDetails"
+      @click="toggleDetails"
+    >
+      <app-icon
+        variant="info"
+        no-margin
+      />
+    </button>
+    <button
+      v-show="props.item.isChangeset || props.item.isNote"
+      class="btn btn-sm btn-light border ms-2"
+      :class="{ active: showDiscussion }"
+      aria-haspopup="true"
+      :aria-expanded="showDiscussion"
+      @click="toggleDiscussion"
+    >
+      <app-icon
+        variant="chat_bubble_outline"
+        no-margin
+      />
+      <span
+        v-show="props.item.hasComments"
+        class="badge bg-primary ms-2"
+      >
+        {{ props.item.commentCount }}
+      </span>
+    </button>
+    <button
+      v-show="props.item.isFeedback"
+      class="btn btn-sm btn-success ms-2"
+    >
+      <app-icon
+        variant="check"
+        no-margin
+      />
+      <span class="d-none d-sm-inline ms-2">Mark as Resolved</span>
+    </button>
+  </nav>
+</template>
+
+<script setup lang="ts">
+import type { ReviewListItem } from '~/services/review';
+
+interface Props {
+  item: ReviewListItem;
+}
+
+const props = defineProps<Props>();
+
+const emit = defineEmits(['edit']);
+const showDetails = defineModel<boolean>('showDetails');
+const showDiscussion = defineModel<boolean>('showDiscussion');
+
+function edit() {
+  emit('edit');
+}
+
+function toggleDetails() {
+  showDetails.value = !showDetails.value;
+}
+
+function toggleDiscussion() {
+  showDiscussion.value = !showDiscussion.value;
+}
+</script>
+
+<style lang="scss">
+.review-toolbar {
+  background-color: var(--bs-body-bg);
+  border-radius: var(--bs-border-radius);
+  padding: 1rem;
+  margin-bottom: 0.5rem;
+  white-space: nowrap;
+  box-shadow: var(--bs-box-shadow-lg);
+}
+</style>
diff --git a/package-lock.json b/package-lock.json
index c1aa9dd..a67869a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,12 +7,16 @@
       "name": "workspaces",
       "hasInstallScript": true,
       "dependencies": {
+        "@osmcha/maplibre-adiff-viewer": "^1.3.1",
+        "@osmcha/osmchange-parser": "^1.0.0",
         "@sentry/integrations": "^7.114.0",
         "@sentry/nuxt": "^10.31.0",
         "@zip.js/zip.js": "^2.7.41",
         "ajv": "^8.17.1",
         "ajv-formats": "^3.0.1",
         "bootstrap": "^5.3.3",
+        "dayjs": "^1.11.19",
+        "maplibre-gl": "^5.10.0",
         "nuxt": "^4.0.0",
         "papaparse": "^5.5.1",
         "vue": "^3.4.19",
@@ -1956,6 +1960,39 @@
       "version": "1.1.1",
       "license": "MIT"
     },
+    "node_modules/@mapbox/geojson-rewind": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/@mapbox/geojson-rewind/-/geojson-rewind-0.5.2.tgz",
+      "integrity": "sha512-tJaT+RbYGJYStt7wI3cq4Nl4SXxG8W7JDG5DMJu97V25RnbNg3QtQtf+KD+VLjNpWKYsRvXDNmNrBgEETr1ifA==",
+      "license": "ISC",
+      "dependencies": {
+        "get-stream": "^6.0.1",
+        "minimist": "^1.2.6"
+      },
+      "bin": {
+        "geojson-rewind": "geojson-rewind"
+      }
+    },
+    "node_modules/@mapbox/geojson-rewind/node_modules/get-stream": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-6.0.1.tgz",
+      "integrity": "sha512-ts6Wi+2j3jQjqi70w5AlN8DFnkSwC+MqmxEzdEALB2qXZYV3X/b1CTfgPLGJNMeAWxdPfU8FO1ms3NUfaHCPYg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@mapbox/jsonlint-lines-primitives": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@mapbox/jsonlint-lines-primitives/-/jsonlint-lines-primitives-2.0.2.tgz",
+      "integrity": "sha512-rY0o9A5ECsTQRVhv7tL/OyDpGAoUB4tTvLiW1DSzQGq4bvTPhNw1VpSNjDJc5GFZ2XuyOtSWSVN05qOtcD71qQ==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/@mapbox/node-pre-gyp": {
       "version": "2.0.0",
       "license": "BSD-3-Clause",
@@ -1982,6 +2019,94 @@
         "node": ">=8"
       }
     },
+    "node_modules/@mapbox/point-geometry": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@mapbox/point-geometry/-/point-geometry-1.1.0.tgz",
+      "integrity": "sha512-YGcBz1cg4ATXDCM/71L9xveh4dynfGmcLDqufR+nQQy3fKwsAZsWd/x4621/6uJaeB9mwOHE6hPeDgXz9uViUQ==",
+      "license": "ISC"
+    },
+    "node_modules/@mapbox/tiny-sdf": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/@mapbox/tiny-sdf/-/tiny-sdf-2.0.7.tgz",
+      "integrity": "sha512-25gQLQMcpivjOSA40g3gO6qgiFPDpWRoMfd+G/GoppPIeP6JDaMMkMrEJnMZhKyyS6iKwVt5YKu02vCUyJM3Ug==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/@mapbox/unitbezier": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/@mapbox/unitbezier/-/unitbezier-0.0.1.tgz",
+      "integrity": "sha512-nMkuDXFv60aBr9soUG5q+GvZYL+2KZHVvsqFCzqnkGEf46U2fvmytHaEVc1/YZbiLn8X+eR3QzX1+dwDO1lxlw==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/@mapbox/vector-tile": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@mapbox/vector-tile/-/vector-tile-2.0.4.tgz",
+      "integrity": "sha512-AkOLcbgGTdXScosBWwmmD7cDlvOjkg/DetGva26pIRiZPdeJYjYKarIlb4uxVzi6bwHO6EWH82eZ5Nuv4T5DUg==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@mapbox/point-geometry": "~1.1.0",
+        "@types/geojson": "^7946.0.16",
+        "pbf": "^4.0.1"
+      }
+    },
+    "node_modules/@mapbox/whoots-js": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@mapbox/whoots-js/-/whoots-js-3.1.0.tgz",
+      "integrity": "sha512-Es6WcD0nO5l+2BOQS4uLfNPYQaNDfbot3X1XUoloz+x0mPDS3eeORZJl06HXjwBG1fOGwCRnzK88LMdxKRrd6Q==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@maplibre/geojson-vt": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/@maplibre/geojson-vt/-/geojson-vt-5.0.4.tgz",
+      "integrity": "sha512-KGg9sma45S+stfH9vPCJk1J0lSDLWZgCT9Y8u8qWZJyjFlP8MNP1WGTxIMYJZjDvVT3PDn05kN1C95Sut1HpgQ==",
+      "license": "ISC"
+    },
+    "node_modules/@maplibre/maplibre-gl-style-spec": {
+      "version": "24.4.1",
+      "resolved": "https://registry.npmjs.org/@maplibre/maplibre-gl-style-spec/-/maplibre-gl-style-spec-24.4.1.tgz",
+      "integrity": "sha512-UKhA4qv1h30XT768ccSv5NjNCX+dgfoq2qlLVmKejspPcSQTYD4SrVucgqegmYcKcmwf06wcNAa/kRd0NHWbUg==",
+      "license": "ISC",
+      "dependencies": {
+        "@mapbox/jsonlint-lines-primitives": "~2.0.2",
+        "@mapbox/unitbezier": "^0.0.1",
+        "json-stringify-pretty-compact": "^4.0.0",
+        "minimist": "^1.2.8",
+        "quickselect": "^3.0.0",
+        "rw": "^1.3.3",
+        "tinyqueue": "^3.0.0"
+      },
+      "bin": {
+        "gl-style-format": "dist/gl-style-format.mjs",
+        "gl-style-migrate": "dist/gl-style-migrate.mjs",
+        "gl-style-validate": "dist/gl-style-validate.mjs"
+      }
+    },
+    "node_modules/@maplibre/mlt": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@maplibre/mlt/-/mlt-1.1.2.tgz",
+      "integrity": "sha512-SQKdJ909VGROkA6ovJgtHNs9YXV4YXUPS+VaZ50I2Mt951SLlUm2Cv34x5Xwc1HiFlsd3h2Yrs5cn7xzqBmENw==",
+      "license": "(MIT OR Apache-2.0)",
+      "dependencies": {
+        "@mapbox/point-geometry": "^1.1.0"
+      }
+    },
+    "node_modules/@maplibre/vt-pbf": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/@maplibre/vt-pbf/-/vt-pbf-4.2.1.tgz",
+      "integrity": "sha512-IxZBGq/+9cqf2qdWlFuQ+ZfoMhWpxDUGQZ/poPHOJBvwMUT1GuxLo6HgYTou+xxtsOsjfbcjI8PZaPCtmt97rA==",
+      "license": "MIT",
+      "dependencies": {
+        "@mapbox/point-geometry": "^1.1.0",
+        "@mapbox/vector-tile": "^2.0.4",
+        "@maplibre/geojson-vt": "^5.0.4",
+        "@types/geojson": "^7946.0.16",
+        "@types/supercluster": "^7.1.3",
+        "pbf": "^4.0.1",
+        "supercluster": "^8.0.1"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "1.0.3",
       "license": "MIT",
@@ -3722,6 +3847,31 @@
         "@opentelemetry/api": "^1.1.0"
       }
     },
+    "node_modules/@osmcha/maplibre-adiff-viewer": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@osmcha/maplibre-adiff-viewer/-/maplibre-adiff-viewer-1.3.1.tgz",
+      "integrity": "sha512-VE67VWJh1DIH6pYlA+8aYxxKkrW1HkaRpV1DyE0Uiot9BSduwBKspnjm0ugKXV9UfbiKRa8/dI//cv/YyEKefw==",
+      "license": "ISC",
+      "dependencies": {
+        "@turf/area": "^7.2.0",
+        "@turf/bbox": "^7.2.0",
+        "@turf/bbox-polygon": "^7.2.0",
+        "deep-equal": "^2.2.3",
+        "id-area-keys": "^6.5.0"
+      },
+      "peerDependencies": {
+        "maplibre-gl": ">4.0.0"
+      }
+    },
+    "node_modules/@osmcha/osmchange-parser": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@osmcha/osmchange-parser/-/osmchange-parser-1.0.0.tgz",
+      "integrity": "sha512-cGGKwlm3BX0iVN3olmp0rGlNxW1XdFC82VmyUS0xXstEi2RlJXn/b/ENrromwBjNNKDFMDWb3V1dwpjAFnwR5g==",
+      "license": "ISC",
+      "dependencies": {
+        "sax": "^1.4.1"
+      }
+    },
     "node_modules/@oxc-minify/binding-android-arm64": {
       "version": "0.80.0",
       "resolved": "https://registry.npmjs.org/@oxc-minify/binding-android-arm64/-/binding-android-arm64-0.80.0.tgz",
@@ -6277,6 +6427,77 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/@turf/area": {
+      "version": "7.3.3",
+      "resolved": "https://registry.npmjs.org/@turf/area/-/area-7.3.3.tgz",
+      "integrity": "sha512-FT66TCxUec+3RsCCyO1kWP57/tiEWEqYfpIs5n44dup401Cne/E+xunahEWxMfP/HSUxfcRQqrjH5vEulLrNoA==",
+      "license": "MIT",
+      "dependencies": {
+        "@turf/helpers": "7.3.3",
+        "@turf/meta": "7.3.3",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@turf/bbox": {
+      "version": "7.3.3",
+      "resolved": "https://registry.npmjs.org/@turf/bbox/-/bbox-7.3.3.tgz",
+      "integrity": "sha512-1zNO/JUgDp0N+3EG5fG7+8EolE95OW1LD8ur0hRP0JK+lRyN0gAvJT7n1I9pu/NIqTa8x/zXxGRc1dcOdohYkg==",
+      "license": "MIT",
+      "dependencies": {
+        "@turf/helpers": "7.3.3",
+        "@turf/meta": "7.3.3",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@turf/bbox-polygon": {
+      "version": "7.3.3",
+      "resolved": "https://registry.npmjs.org/@turf/bbox-polygon/-/bbox-polygon-7.3.3.tgz",
+      "integrity": "sha512-m2WfHVoJLZJf+nJizRfnm0GHyJN3eYY/oWL6xsp1bDodgBgrNqNPRD3OfA00x4HIt5VYXOyQ0GMDfvILLjlXWw==",
+      "license": "MIT",
+      "dependencies": {
+        "@turf/helpers": "7.3.3",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@turf/helpers": {
+      "version": "7.3.3",
+      "resolved": "https://registry.npmjs.org/@turf/helpers/-/helpers-7.3.3.tgz",
+      "integrity": "sha512-9Ias0L1GuZPIzO6sk8jraTEuLJye6n9LYNEdw69ZGOQ6C1IigjxkPW49zmn21aTv1z27vxdVLSS3r+78DB2QnQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
+    "node_modules/@turf/meta": {
+      "version": "7.3.3",
+      "resolved": "https://registry.npmjs.org/@turf/meta/-/meta-7.3.3.tgz",
+      "integrity": "sha512-Tz1j4h70iFB5SebWWoVv/uL59x4aOngXU+d1xQDXzOCn/O6txnreGVGMcYU362c5F06yqZx38H9UFTQ553lK0w==",
+      "license": "MIT",
+      "dependencies": {
+        "@turf/helpers": "7.3.3",
+        "@types/geojson": "^7946.0.10",
+        "tslib": "^2.8.1"
+      },
+      "funding": {
+        "url": "https://opencollective.com/turf"
+      }
+    },
     "node_modules/@tybys/wasm-util": {
       "version": "0.10.0",
       "license": "MIT",
@@ -6326,7 +6547,6 @@
       "version": "7946.0.16",
       "resolved": "https://registry.npmjs.org/@types/geojson/-/geojson-7946.0.16.tgz",
       "integrity": "sha512-6C8nqWur3j98U6+lXDfTUWIfgvZU+EumvpHKcYjujKH7woYyLj2sUmff0tRhrqM7BohUw7Pz3ZB1jj2gW9Fvmg==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/@types/json-schema": {
@@ -6387,6 +6607,15 @@
       "version": "1.20.2",
       "license": "MIT"
     },
+    "node_modules/@types/supercluster": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@types/supercluster/-/supercluster-7.1.3.tgz",
+      "integrity": "sha512-Z0pOY34GDFl3Q6hUFYf3HkTwKEE02e7QgtJppBt+beEAxnyOpJua+voGFvxINBHa06GwLFFym7gRPY2SiKIfIA==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/geojson": "*"
+      }
+    },
     "node_modules/@types/tedious": {
       "version": "4.0.14",
       "resolved": "https://registry.npmjs.org/@types/tedious/-/tedious-4.0.14.tgz",
@@ -7755,6 +7984,22 @@
       "devOptional": true,
       "license": "Python-2.0"
     },
+    "node_modules/array-buffer-byte-length": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-buffer-byte-length/-/array-buffer-byte-length-1.0.2.tgz",
+      "integrity": "sha512-LHE+8BuR7RYGDKvnrmcuSq3tDcKv9OFEXQt/HpbZhY7V6h0zlUXutnAD82GiFx9rdieCMjkvtcsPqBwgUl1Iiw==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.3",
+        "is-array-buffer": "^3.0.5"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/ast-kit": {
       "version": "2.1.2",
       "license": "MIT",
@@ -7833,6 +8078,21 @@
         "postcss": "^8.1.0"
       }
     },
+    "node_modules/available-typed-arrays": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.7.tgz",
+      "integrity": "sha512-wvUjBtSGN7+7SjNpq/9M2Tg350UZD3q62IFZLbRAR1bSMlCo1ZaeW+BJ+D090e4hIIZLBcTDWe4Mh4jvUDajzQ==",
+      "license": "MIT",
+      "dependencies": {
+        "possible-typed-array-names": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/b4a": {
       "version": "1.6.7",
       "license": "Apache-2.0"
@@ -8122,6 +8382,24 @@
         "node": ">=8"
       }
     },
+    "node_modules/call-bind": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.8.tgz",
+      "integrity": "sha512-oKlSFMcMwpUg2ednkhQ454wfWiU/ul3CkJe/PEHcTKuiX6RpbehUiFMXu13HalGZxfUwCQzZG747YXBn1im9ww==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bind-apply-helpers": "^1.0.0",
+        "es-define-property": "^1.0.0",
+        "get-intrinsic": "^1.2.4",
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+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/which-collection/-/which-collection-1.0.2.tgz",
+      "integrity": "sha512-K4jVyjnBdgvc86Y6BkaLZEN933SwYOuBFkdmBu9ZfkcAbdVbpITnDmjvZ/aQjRXQrv5EPkTnD1s39GiiqbngCw==",
+      "license": "MIT",
+      "dependencies": {
+        "is-map": "^2.0.3",
+        "is-set": "^2.0.3",
+        "is-weakmap": "^2.0.2",
+        "is-weakset": "^2.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/which-typed-array": {
+      "version": "1.1.20",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.20.tgz",
+      "integrity": "sha512-LYfpUkmqwl0h9A2HL09Mms427Q1RZWuOHsukfVcKRq9q95iQxdw0ix1JQrqbcDR9PH1QDwf5Qo8OZb5lksZ8Xg==",
+      "license": "MIT",
+      "dependencies": {
+        "available-typed-arrays": "^1.0.7",
+        "call-bind": "^1.0.8",
+        "call-bound": "^1.0.4",
+        "for-each": "^0.3.5",
+        "get-proto": "^1.0.1",
+        "gopd": "^1.2.0",
+        "has-tostringtag": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/winston": {
       "version": "3.17.0",
       "license": "MIT",
diff --git a/package.json b/package.json
index 5e693a0..5578ed6 100644
--- a/package.json
+++ b/package.json
@@ -12,12 +12,16 @@
     "lint:fix": "eslint . --fix"
   },
   "dependencies": {
+    "@osmcha/maplibre-adiff-viewer": "^1.3.1",
+    "@osmcha/osmchange-parser": "^1.0.0",
     "@sentry/integrations": "^7.114.0",
     "@sentry/nuxt": "^10.31.0",
     "@zip.js/zip.js": "^2.7.41",
     "ajv": "^8.17.1",
     "ajv-formats": "^3.0.1",
     "bootstrap": "^5.3.3",
+    "dayjs": "^1.11.19",
+    "maplibre-gl": "^5.10.0",
     "nuxt": "^4.0.0",
     "papaparse": "^5.5.1",
     "vue": "^3.4.19",
diff --git a/pages/dashboard.vue b/pages/dashboard.vue
index 738db87..f4cc716 100644
--- a/pages/dashboard.vue
+++ b/pages/dashboard.vue
@@ -49,7 +49,7 @@ let lastWorkspaceId: number;
 </script>
 
 <script setup lang="ts">
-import { workspacesClient, osmClient, tdeiUserClient } from '~/services/index';
+import { workspacesClient } from '~/services/index';
 import { compareWorkspaceCreatedAtDesc } from '~/services/workspaces';
 
 const route = useRoute();
diff --git a/pages/workspace/[id]/review.vue b/pages/workspace/[id]/review.vue
new file mode 100644
index 0000000..0b5bbd6
--- /dev/null
+++ b/pages/workspace/[id]/review.vue
@@ -0,0 +1,138 @@
+<template>
+  <section
+    class="review-page"
+    fluid
+  >
+    <review-sidebar
+      v-model:item="currentItem"
+      v-model:filter="filter"
+      :review-list="reviewList"
+      :loading="loading"
+      @refresh="refresh"
+    />
+
+    <section class="map-container">
+      <review-map
+        ref="map"
+        v-model:loading="loadingMap"
+        v-model:current-diff="currentDiff"
+        :workspace-id="workspaceId"
+        :item="currentItem"
+      />
+
+      <transition name="fade">
+        <div
+          v-show="loadingMap"
+          class="map-loading-overlay"
+        >
+          <app-spinner size="lg" />
+        </div>
+      </transition>
+      <transition name="fade">
+        <div
+          v-show="!currentItem"
+          class="review-notice"
+        >
+          <!-- TODO: add some content/help here -->
+        </div>
+      </transition>
+
+      <review-overlay
+        v-if="currentItem"
+        :item="currentItem"
+        @edit="openEditor"
+      />
+      <review-attribute-diff
+        v-if="currentDiff && reviewList.workspace"
+        :dataset-type="reviewList.workspace.type"
+        :diff="currentDiff"
+      />
+    </section>
+  </section>
+</template>
+
+<script setup lang="ts">
+import { reviewManager } from '~/services/index';
+
+import type ReviewMap from '~/components/review/Map.vue';
+import type { ReviewListItem } from '~/services/review.ts';
+import type { AdiffAction } from '~/types/adiff';
+
+const route = useRoute();
+const workspaceId = Number(route.params.id);
+
+const reviewList = reviewManager.getList(workspaceId);
+const filter = reactive(reviewManager.getFilter());
+
+const map = useTemplateRef<InstanceType<typeof ReviewMap>>('map');
+
+const loading = ref(false);
+const loadingMap = ref(false);
+const currentItem = ref<ReviewListItem | undefined>();
+const currentDiff = ref<AdiffAction | undefined>();
+
+refresh();
+
+watch(currentItem, () => {
+  currentDiff.value = undefined;
+});
+
+async function refresh() {
+  if (loading.value) {
+    return;
+  }
+
+  loading.value = true;
+
+  try {
+    await reviewList.refresh(filter);
+  }
+  finally {
+    loading.value = false;
+  }
+}
+
+async function openEditor() {
+  if (!map.value) {
+    return;
+  }
+
+  const { lat, lon, zoom } = map.value.getLatLonZoom();
+
+  await navigateTo({
+    path: `/workspace/${workspaceId}/edit`,
+    query: { datatype: reviewList.workspace?.type },
+    hash: `#map=${zoom}/${lat}/${lon}`,
+  });
+}
+</script>
+
+<style lang="scss">
+.review-page {
+  display: flex;
+  height: 100%;
+
+  .map-container {
+    position: relative;
+    background-color: #AAAAAA;
+    flex: 1 1 75%;
+    height: 100%;
+  }
+
+  .review-notice,
+  .map-loading-overlay,
+  .map-loading-overlay .spinner-border {
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+    margin: auto;
+    background-color: #AAAAAA;
+  }
+
+  .review-notice {
+    background-color: var(--bs-body-bg);
+  }
+}
+</style>
diff --git a/services/cache.ts b/services/cache.ts
new file mode 100644
index 0000000..218e002
--- /dev/null
+++ b/services/cache.ts
@@ -0,0 +1,168 @@
+export type ValidCacheKey = IDBValidKey | { [key: string]: IDBValidKey };
+
+export interface LocalCache<TKey extends ValidCacheKey, TValue> {
+  get(key: TKey): Promise<TValue | undefined>;
+  set(key: TKey, value: TValue): Promise<void>;
+  evict(key: TKey): Promise<void>;
+  prune(): Promise<void>;
+}
+
+const CACHE_DB_VERSION = 1;
+const CACHE_STORE_NAME = 'cache';
+
+export class LruIndexedDbCache<TKey extends ValidCacheKey, TValue>
+implements LocalCache<TKey, TValue> {
+  readonly dbName: string;
+  readonly ttlMilliseconds: number;
+  readonly keyPath: IDBObjectStoreParameters['keyPath'];
+
+  #db?: IDBDatabase;
+  #openPromise?: Promise<IDBDatabase>;
+
+  constructor(
+    dbName: string,
+    ttlMilliseconds: number,
+    keyPath: IDBObjectStoreParameters['keyPath'],
+  ) {
+    this.dbName = dbName;
+    this.ttlMilliseconds = ttlMilliseconds;
+    this.keyPath = keyPath;
+  }
+
+  get(key: TKey): Promise<TValue | undefined> {
+    return new Promise((resolve, reject) => {
+      this.#tx((store) => {
+        const request = typeof key === 'object'
+          ? store.get(Object.values(key)) // composite key
+          : store.get(key); // simple key
+
+        request.onsuccess = () => {
+          const entry = request.result;
+
+          if (!entry) {
+            return resolve(undefined);
+          }
+
+          // This implementation doesn't enforce strict eviction on access.
+          // As in, we don't check for expiration here, and there is no max
+          // age setting (yet). This cache will return entries that expired
+          // between prune operations and even refresh the stale entry:
+          //
+          entry.lastAccessed = Date.now();
+          store.put(entry);
+          resolve(entry.value);
+        };
+
+        request.onerror = () => reject(request.error);
+      });
+    });
+  }
+
+  set(key: TKey, value: TValue): Promise<void> {
+    return this.#tx((store) => {
+      if (typeof key === 'object') {
+        store.put({ ...key, value, lastAccessed: Date.now() }); // composite key
+      }
+      else {
+        store.put({ key, value, lastAccessed: Date.now() }); // simple key
+      }
+    });
+  }
+
+  evict(key: TKey): Promise<void> {
+    return this.#tx((store) => {
+      if (typeof key === 'object') {
+        store.delete(Object.values(key)); // composite key
+      }
+      else {
+        store.delete(key); // simple key
+      }
+    });
+  }
+
+  prune(): Promise<void> {
+    const expirationTime = Date.now() - this.ttlMilliseconds;
+    console.info(`Evicting entries in "${this.dbName}" < ${expirationTime}`);
+
+    return this.#tx((store) => {
+      const index = store.index('lastAccessed');
+      const request = index.openCursor(IDBKeyRange.upperBound(expirationTime));
+
+      request.onsuccess = () => {
+        const cursor = request.result;
+
+        if (cursor) {
+          cursor.delete();
+          cursor.continue();
+        }
+      };
+    });
+  }
+
+  async #open(): Promise<IDBDatabase> {
+    if (this.#db) {
+      return this.#db;
+    }
+    if (this.#openPromise) {
+      return this.#openPromise;
+    }
+
+    this.#openPromise = new Promise((resolve, reject) => {
+      const request = indexedDB.open(this.dbName, CACHE_DB_VERSION);
+
+      request.onupgradeneeded = () => {
+        this.#upgradeDb(request.result);
+      };
+      request.onerror = () => {
+        reject(request.error);
+      };
+
+      request.onsuccess = () => {
+        this.#db = request.result;
+        this.#db.onversionchange = () => {
+          // Close the DB if it opens in another tab with a different version:
+          this.#db?.close();
+        };
+
+        resolve(this.#db);
+      };
+    });
+
+    try {
+      return await this.#openPromise;
+    }
+    finally {
+      this.#openPromise = undefined;
+    }
+  }
+
+  async #tx(callback: (store: IDBObjectStore) => void): Promise<void> {
+    const db = await this.#open();
+
+    return new Promise((resolve, reject) => {
+      const tx = db.transaction(CACHE_STORE_NAME, 'readwrite');
+      tx.oncomplete = () => {
+        resolve();
+      };
+      tx.onabort = () => {
+        reject(tx.error);
+      };
+      tx.onerror = () => {
+        reject(tx.error);
+      };
+
+      callback(tx.objectStore(CACHE_STORE_NAME));
+    });
+  }
+
+  #upgradeDb(db: IDBDatabase) {
+    console.info(`Upgrading ${this.dbName} to version ${CACHE_DB_VERSION}`);
+
+    if (!db.objectStoreNames.contains(CACHE_STORE_NAME)) {
+      const store = db.createObjectStore(CACHE_STORE_NAME, {
+        keyPath: this.keyPath,
+      });
+      store.createIndex('lastAccessed', 'lastAccessed');
+    }
+  }
+}
diff --git a/services/changesets.ts b/services/changesets.ts
new file mode 100644
index 0000000..49d6c1e
--- /dev/null
+++ b/services/changesets.ts
@@ -0,0 +1,449 @@
+import type { OsmApiClient } from '~/services/osm';
+import { OSMCHANGE_ACTION_TYPES } from '~/types/osm';
+import { LruIndexedDbCache } from '~/services/cache';
+
+import type { LocalCache } from '~/services/cache';
+import type {
+  OsmChange,
+  OsmChangeset,
+  OsmElement,
+  OsmNode,
+  OsmElementType,
+} from '~/types/osm';
+import type {
+  AdiffAction,
+  AdiffElement,
+  AdiffNode,
+  AdiffWay,
+  AdiffWayNodeRef,
+  AugmentedDiff,
+} from '~/types/adiff';
+import type { WorkspaceId } from '~/types/workspaces';
+
+const ADIFF_ACTION_TYPES = OSMCHANGE_ACTION_TYPES;
+
+export type OsmChangeCacheKey = { workspaceId: WorkspaceId; changesetId: number };
+export const OsmChangeDb = LruIndexedDbCache<OsmChangeCacheKey, OsmChange>;
+export type AugmentedDiffCacheKey = { workspaceId: WorkspaceId; changesetId: number };
+export const AugmentedDiffDb = LruIndexedDbCache<AugmentedDiffCacheKey, AugmentedDiff>;
+
+export class OsmChangeCache {
+  readonly #cache: LocalCache<OsmChangeCacheKey, OsmChange>;
+
+  constructor(cache: LocalCache<OsmChangeCacheKey, OsmChange>) {
+    this.#cache = cache;
+  }
+
+  async get(workspaceId: WorkspaceId, changesetId: number): Promise<OsmChange | undefined> {
+    const osmChange = await this.#cache.get({ workspaceId, changesetId });
+
+    if (osmChange) {
+      for (const type of OSMCHANGE_ACTION_TYPES) {
+        for (const element of osmChange[type] ?? []) {
+          element.timestamp = new Date(element.timestamp);
+        }
+      }
+
+      return osmChange;
+    }
+  }
+
+  set(workspaceId: WorkspaceId, changesetId: number, osmChange: OsmChange): Promise<void> {
+    return this.#cache.set({ workspaceId, changesetId }, osmChange);
+  }
+
+  prune(): Promise<void> {
+    return this.#cache.prune();
+  }
+}
+
+export class AugmentedDiffCache {
+  readonly #cache: LocalCache<AugmentedDiffCacheKey, AugmentedDiff>;
+
+  constructor(cache: LocalCache<AugmentedDiffCacheKey, AugmentedDiff>) {
+    this.#cache = cache;
+  }
+
+  async get(workspaceId: WorkspaceId, changesetId: number): Promise<AugmentedDiff | undefined> {
+    const adiff = await this.#cache.get({ workspaceId, changesetId });
+
+    if (adiff) {
+      return adiff;
+    }
+  }
+
+  set(workspaceId: WorkspaceId, changesetId: number, adiff: AugmentedDiff) {
+    return this.#cache.set({ workspaceId, changesetId }, adiff);
+  }
+
+  prune(): Promise<void> {
+    return this.#cache.prune();
+  }
+}
+
+export class ChangesetManager {
+  readonly #osmClient: OsmApiClient;
+  readonly #oscCache: OsmChangeCache;
+  readonly #adiffCache: AugmentedDiffCache; ;
+
+  constructor(
+    osmClient: OsmApiClient,
+    oscCache: OsmChangeCache,
+    adiffCache: AugmentedDiffCache,
+  ) {
+    this.#osmClient = osmClient;
+    this.#oscCache = oscCache;
+    this.#adiffCache = adiffCache;
+
+    this.pruneCache();
+  }
+
+  async getFullChangesets(workspaceId: WorkspaceId): Promise<OsmChangeset[]> {
+    const changesets = await this.#osmClient.listChangesets(workspaceId);
+    const promises = [];
+
+    for (const changeset of changesets) {
+      promises.push(
+        this.getOsc(workspaceId, changeset).then(c => changeset.osmChange = c),
+      );
+    }
+
+    await Promise.all(promises);
+
+    return changesets;
+  }
+
+  async pruneCache() {
+    const executeCallback: (f: () => void) => void = window.requestIdleCallback
+      ?? ((f: () => void) => f());
+    executeCallback(() => {
+      this.#oscCache.prune();
+    });
+    executeCallback(() => {
+      this.#adiffCache.prune();
+    });
+  }
+
+  async getOsc(workspaceId: WorkspaceId, changeset: OsmChangeset): Promise<OsmChange> {
+    if (changeset.open) {
+      // Skip the cache--someone may add more to this changeset:
+      return await this.#osmClient.getOsmChange(workspaceId, changeset.id);
+    }
+
+    let osc = await this.#oscCache.get(workspaceId, changeset.id);
+
+    if (!osc) {
+      osc = await this.#osmClient.getOsmChange(workspaceId, changeset.id);
+      await this.#oscCache.set(workspaceId, changeset.id, osc);
+    }
+
+    return osc;
+  }
+
+  async getAdiff(workspaceId: WorkspaceId, changeset: OsmChangeset): Promise<AugmentedDiff> {
+    if (changeset.open) {
+      // Skip the cache--someone may add more to this changeset:
+      return await this.#buildAdiff(workspaceId, changeset.osmChange);
+    }
+
+    let adiff = await this.#adiffCache.get(workspaceId, changeset.id);
+
+    if (!adiff) {
+      adiff = await this.#buildAdiff(workspaceId, changeset.osmChange);
+      await this.#adiffCache.set(workspaceId, changeset.id, adiff);
+    }
+
+    return adiff;
+  }
+
+  async #buildAdiff(workspaceId: WorkspaceId, osmChange: OsmChange): Promise<AugmentedDiff> {
+    const builder = new ChangesetAdiffBuilder(this.#osmClient, workspaceId);
+
+    return await builder.build(osmChange);
+  }
+}
+
+function isNode(element: AdiffElement): element is AdiffNode {
+  return element.type === 'node';
+}
+
+function isWay(element: AdiffElement): element is AdiffWay {
+  return element.type === 'way';
+}
+
+function osmToAdiff(element: OsmElement): AdiffElement {
+  const adiff: AdiffElement = {
+    ...(element as AdiffElement),
+    visible: element.visible ?? true,
+    tags: { ...element.tags },
+  };
+
+  if ('nodes' in adiff && 'nodes' in element) {
+    adiff.nodes = element.nodes?.map(ref => ({ ref, lat: 0, lon: 0 }));
+  }
+
+  return adiff;
+}
+
+function nodeToRef(node: OsmNode): AdiffWayNodeRef {
+  return { ref: node.id, lat: node.lat, lon: node.lon };
+}
+
+function splitIdVersion(idVersion: string): [number, number] {
+  const idVersionParts = idVersion.split('v');
+  const id = Number(idVersionParts[0]);
+  const version = Number(idVersionParts[1]);
+
+  return [id, version];
+}
+
+type OsmElementVersionMap = Map<number, OsmElement>;
+type OsmElementMap = Map<number, OsmElementVersionMap>;
+type OsmTypeMap = {
+  [K in OsmElementType]: {
+    fromChangesetIds: Set<number>;
+    versions: OsmElementMap;
+  }
+};
+
+class AdiffElementCache {
+  readonly #typeMap: OsmTypeMap;
+
+  constructor() {
+    this.#typeMap = {
+      node: { fromChangesetIds: new Set(), versions: new Map() },
+      way: { fromChangesetIds: new Set(), versions: new Map() },
+      relation: { fromChangesetIds: new Set(), versions: new Map() },
+    };
+  }
+
+  remember(element: OsmElement, fromChangeset: boolean = false) {
+    this.getVersions(element.type, element.id).set(element.version, element);
+
+    if (fromChangeset) {
+      this.#typeMap[element.type].fromChangesetIds.add(element.id);
+    }
+  }
+
+  getVersions(type: OsmElementType, id: number): OsmElementVersionMap {
+    let versionMap = this.#typeMap[type].versions.get(id);
+
+    if (!versionMap) {
+      versionMap = new Map();
+      this.#typeMap[type].versions.set(id, versionMap);
+    }
+
+    return versionMap;
+  }
+
+  getVersion<T extends OsmElement>(
+    type: T['type'],
+    id: number,
+    version: number,
+  ): T | undefined {
+    return this.#typeMap[type].versions.get(id)?.get(version) as T;
+  }
+
+  getLatestVersion<T extends OsmElement>(type: T['type'], id: number): T | undefined {
+    const versionMap = this.#typeMap[type].versions.get(id);
+
+    if (!versionMap) {
+      return undefined;
+    }
+
+    return versionMap.get(Math.max(...versionMap.keys())) as T;
+  }
+
+  isInChangeset(type: OsmElementType, id: number): boolean {
+    return this.#typeMap[type].fromChangesetIds.has(id);
+  }
+}
+
+class ChangesetAdiffBuilder {
+  readonly #osmClient: OsmApiClient;
+  readonly #workspaceId: WorkspaceId;
+  readonly #cache: AdiffElementCache;
+  readonly #actions: AdiffAction[];
+
+  constructor(osmClient: OsmApiClient, workspaceId: WorkspaceId) {
+    this.#osmClient = osmClient;
+    this.#workspaceId = workspaceId;
+    this.#cache = new AdiffElementCache();
+    this.#actions = [];
+  }
+
+  async build(osmChange: OsmChange): Promise<AugmentedDiff> {
+    const actions: AdiffAction[] = [];
+    const promises = [];
+
+    for (const type of ADIFF_ACTION_TYPES) {
+      for (const element of osmChange[type] ?? []) {
+        actions.push({ type, old: undefined, new: osmToAdiff(element) });
+        this.#cache.remember(element, true);
+      }
+    }
+
+    for (const action of actions) {
+      this.#actions.push(action);
+
+      if (action.type !== 'create') {
+        promises.push(
+          this.#getPreviousElement(action.new).then(e => action.old = e),
+        );
+      }
+
+      promises.push(this.#expandReferences(action));
+    }
+
+    await Promise.all(promises);
+
+    return { actions: this.#actions };
+  }
+
+  #expandReferences(action: AdiffAction): Promise<void> {
+    if (isNode(action.new)) {
+      return this.#expandNodeReferences(action.new);
+    }
+
+    return this.#expandWayReferences(action.new);
+  }
+
+  async #expandNodeReferences(node: AdiffNode): Promise<void> {
+    const ways = await this.#fetchWays(node);
+
+    for (const way of ways) {
+      if (this.#cache.isInChangeset('way', way.id)) {
+        continue;
+      }
+
+      const old = { ...way, nodes: [...way.nodes ?? []], tags: { ...way.tags } };
+      const action: AdiffAction = { type: 'modify', old, new: way };
+
+      while (action.old && action.old.changeset > node.changeset) {
+        action.old = await this.#getPreviousElement(action.old);
+      }
+
+      if (action.old === old) {
+        await this.#resolveWayNodes(old, old.changeset);
+      }
+
+      this.#actions.push(action);
+    }
+  }
+
+  async #expandWayReferences(way: AdiffWay): Promise<void> {
+    await this.#resolveWayNodes(way, way.changeset);
+  }
+
+  async #resolveWayNodes(element: AdiffWay, changesetId: number) {
+    const resolvedNodes: AdiffWayNodeRef[] = [];
+    let nodeIds: (string | number)[] = element.nodes?.map(r => r.ref) ?? [];
+
+    while (nodeIds.length > 0) {
+      const refs = await this.#fetchNodes(nodeIds);
+      nodeIds = [];
+
+      for (const node of refs) {
+        if (node.changeset <= changesetId) {
+          resolvedNodes.push(nodeToRef(node));
+        }
+        else {
+          nodeIds.push(`${node.id}v${node.version - 1}`);
+        }
+      }
+    }
+
+    element.nodes = resolvedNodes;
+  }
+
+  async #fetchNodes(nodeIds: (string | number)[]): Promise<OsmNode[]> {
+    const refs: OsmNode[] = [];
+    const pendingIds = [];
+
+    for (const nodeId of nodeIds) {
+      if (Number.isFinite(nodeId)) {
+        const node = this.#cache.getLatestVersion<OsmNode>('node', nodeId as number);
+
+        if (node) {
+          refs.push(node);
+        }
+        else {
+          pendingIds.push(nodeId);
+        }
+      }
+      else {
+        const [id, version] = splitIdVersion(nodeId as string);
+        const node = this.#cache.getVersion<OsmNode>('node', id, version);
+
+        if (node) {
+          refs.push(node);
+        }
+        else {
+          pendingIds.push(nodeId);
+        }
+      }
+    }
+
+    if (pendingIds.length > 0) {
+      const nodes = await this.#osmClient.getNodes(this.#workspaceId, pendingIds);
+
+      for (const node of nodes) {
+        refs.push(node);
+        this.#cache.remember(node);
+      }
+    }
+
+    return refs;
+  }
+
+  async #fetchWays(node: AdiffElement): Promise<AdiffWay[]> {
+    let ways = await this.#osmClient.getWaysForNode(this.#workspaceId, node.id);
+    const resolvedWays = [];
+
+    while (ways.length > 0) {
+      const pendingWayIds = [];
+
+      for (const way of ways) {
+        if (way.changeset <= node.changeset) {
+          const adiffWay = osmToAdiff(way) as AdiffWay;
+          await this.#resolveWayNodes(adiffWay, node.changeset);
+          resolvedWays.push(adiffWay);
+        }
+        else {
+          pendingWayIds.push(`${way.id}v${way.version - 1}`);
+        }
+      }
+
+      if (pendingWayIds.length > 0) {
+        ways = await this.#osmClient.getWays(this.#workspaceId, pendingWayIds);
+      }
+      else {
+        ways.length = 0;
+      }
+    }
+
+    return resolvedWays;
+  }
+
+  async #getPreviousElement(element: AdiffElement): Promise<AdiffElement> {
+    const version = element.version - 1;
+    let prevElement = this.#cache.getVersion(element.type, element.id, version);
+
+    if (!prevElement) {
+      prevElement = await this.#osmClient.getElement(
+        this.#workspaceId,
+        element.type,
+        element.id,
+        version);
+      this.#cache.remember(prevElement);
+    }
+
+    const adiffElement = osmToAdiff(prevElement);
+
+    if (isWay(adiffElement)) {
+      await this.#resolveWayNodes(adiffElement, element.changeset - 1);
+    }
+
+    return adiffElement;
+  }
+}
diff --git a/services/index.ts b/services/index.ts
index 29fd560..c298ef7 100644
--- a/services/index.ts
+++ b/services/index.ts
@@ -1,7 +1,15 @@
 import { reactive } from 'vue';
 import { TdeiAuthStore, TdeiClient, TdeiUserClient } from '~/services/tdei';
+import {
+  AugmentedDiffCache,
+  AugmentedDiffDb,
+  OsmChangeCache,
+  OsmChangeDb,
+  ChangesetManager,
+} from '~/services/changesets';
 import { OsmApiClient } from '~/services/osm';
 import { PathwaysEditorManager } from '~/services/pathways';
+import { ReviewManager } from '~/services/review';
 import { RapidManager } from '~/services/rapid';
 import { WorkspacesClient } from '~/services/workspaces';
 
@@ -21,5 +29,24 @@ tdeiClient.restartAutoAuthRefresh();
 export const osmClient = new OsmApiClient(osmWebUrl, osmApiUrl, tdeiClient);
 export const workspacesClient = new WorkspacesClient(apiUrl, tdeiClient, osmClient);
 
+const oscCacheTtl = 1000 * 60 * 60 * 24 * 45; // 45 days
+const adiffCacheTtl = oscCacheTtl;
+const oscKeypath = ['workspaceId', 'changesetId'];
+const adiffKeypath = oscKeypath;
+
+const oscCacheDb = new OsmChangeDb('osc-cache', oscCacheTtl, oscKeypath);
+const adiffCacheDb = new AugmentedDiffDb('adiff-cache', adiffCacheTtl, adiffKeypath);
+
+export const changesetManager = new ChangesetManager(
+  osmClient,
+  new OsmChangeCache(oscCacheDb),
+  new AugmentedDiffCache(adiffCacheDb));
+export const reviewManager = new ReviewManager(
+  changesetManager,
+  osmClient,
+  tdeiClient,
+  workspacesClient,
+);
+
 export const rapidManager = new RapidManager(rapidUrl, osmWebUrl, tdeiAuth);
 export const pathwaysManager = new PathwaysEditorManager(pathwaysUrl, osmWebUrl, tdeiAuth);
diff --git a/services/osm.ts b/services/osm.ts
index 7b3bf02..91ef12d 100644
--- a/services/osm.ts
+++ b/services/osm.ts
@@ -1,7 +1,23 @@
+import parseOsmChangeXml from '@osmcha/osmchange-parser';
+import type { FeatureCollection, Point } from 'geojson';
+
 import { BaseHttpClient, BaseHttpClientError } from "~/services/http";
+import * as xml from '~/util/xml';
+
 import type { ICancelableClient } from '~/services/loading';
 import type { TdeiClient } from '~/services/tdei';
-import * as xml from '~/util/xml';
+import { OSMCHANGE_ACTION_TYPES } from '~/types/osm';
+import type {
+  OsmChange,
+  OsmChangeset,
+  OsmChangesetComment,
+  OsmElement,
+  OsmNode,
+  OsmNote,
+  OsmTags,
+  OsmWay,
+} from '~/types/osm';
+import type { WorkspaceId } from '~/types/workspaces';
 
 function formatFeatureIdPlaceholder(attributeName: string, feature: Element) {
   const id = feature.getAttribute(attributeName);
@@ -36,6 +52,30 @@ function formatFeatureIdPlaceholders(feature: Element) {
   }
 }
 
+function notesGeoJsonToEntities(geoJson: FeatureCollection): OsmNote[] {
+  const notes = [];
+
+  for (const feature of geoJson.features) {
+    const geometry = feature.geometry as Point;
+    const properties = feature.properties ?? { };
+
+    for (const comment of properties.comments) {
+      comment.date = new Date(comment.date);
+    }
+
+    notes.push({
+      id: properties.id,
+      status: properties.status,
+      lat: geometry.coordinates[1] ?? 0,
+      lon: geometry.coordinates[0] ?? 0,
+      created_at: new Date(properties.date_created),
+      comments: properties.comments,
+    });
+  }
+
+  return notes;
+}
+
 function cleanOscForDemo(features: Element[]) {
   const nodeIds = new Set();
   const ways = [];
@@ -207,8 +247,8 @@ export class OsmApiClient extends BaseHttpClient implements ICancelableClient {
     await this._delete(`workspaces/${workspaceId}`);
   }
 
-  async getWorkspaceBbox(id: number) {
-    const response = await this._get(`workspaces/${id}/bbox.json`);
+  async getWorkspaceBbox(workspaceId: number) {
+    const response = await this._get(`workspaces/${workspaceId}/bbox.json`);
 
     if (response.status === 204) {
       return undefined
@@ -238,7 +278,147 @@ export class OsmApiClient extends BaseHttpClient implements ICancelableClient {
     return `${bbox.min_lon},${bbox.min_lat},${bbox.max_lon + pad},${bbox.max_lat + pad}`;
   }
 
-  async createChangeset(workspaceId: number): number {
+  async getElement(
+    workspaceId: WorkspaceId,
+    type: string,
+    id: number,
+    version: number,
+  ): Promise<OsmElement> {
+    const response = await this._get(`${type}/${id}/${version}`, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/json',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    const element = (await response.json()).elements[0];
+    element.tags = element.tags ?? { };
+
+    return element;
+  }
+
+  async getNodes(workspaceId: WorkspaceId, nodeIds: (number | string)[]): Promise<OsmNode[]> {
+    const response = await this._get(`nodes?nodes=${nodeIds.join(',')}`, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/json',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    const nodes = (await response.json()).elements;
+
+    for (const node of nodes) {
+      node.timestamp = new Date(node.timestamp);
+    }
+
+    return nodes;
+  }
+
+  async getWays(workspaceId: WorkspaceId, wayIds: (number | string)[]): Promise<OsmWay[]> {
+    const response = await this._get(`ways?ways=${wayIds.join(',')}`, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/json',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    const ways = (await response.json()).elements;
+
+    for (const way of ways) {
+      way.timestamp = new Date(way.timestamp);
+    }
+
+    return ways;
+  }
+
+  async getWaysForNode(workspaceId: WorkspaceId, nodeId: number): Promise<OsmElement[]> {
+    const response = await this._get(`node/${nodeId}/ways`, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/json',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    return (await response.json()).elements;
+  }
+
+  async listChangesets(workspaceId: WorkspaceId): Promise<OsmChangeset[]> {
+    const response = await this._get(`changesets.json`, {
+      headers: { ...this._requestHeaders, 'X-Workspace': workspaceId },
+    });
+
+    const changesets = (await response.json())?.changesets ?? [];
+
+    for (const changeset of changesets) {
+      changeset.created_at = new Date(changeset.created_at);
+      changeset.closed_at = new Date(changeset.closed_at);
+    }
+
+    return changesets;
+  }
+
+  async getChangeset(
+    workspaceId: WorkspaceId,
+    changesetId: number,
+    includeDiscussion: boolean = false,
+  ): Promise<OsmChangeset | undefined> {
+    let url = `changeset/${changesetId}.json`;
+
+    if (includeDiscussion) {
+      url += '?include_discussion=true';
+    }
+
+    const response = await this._get(url, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/json',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    const changeset = (await response.json())?.changeset;
+
+    if (!changeset) {
+      return;
+    }
+
+    changeset.created_at = new Date(changeset.created_at);
+    changeset.closed_at = new Date(changeset.closed_at);
+
+    for (const comment of changeset.comments ?? []) {
+      comment.date = new Date(comment.date);
+    }
+
+    return changeset;
+  }
+
+  async getOsmChange(workspaceId: WorkspaceId, changesetId: number)
+    : Promise<OsmChange>
+  {
+    const response = await this._get(`changeset/${changesetId}/download`, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/xml',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    const osmChange = parseOsmChangeXml(await response.text());
+
+    for (const type of OSMCHANGE_ACTION_TYPES) {
+      for (const element of osmChange[type] ?? []) {
+        element.timestamp = new Date(element.timestamp);
+      }
+    }
+
+    return osmChange;
+  }
+
+  async createChangeset(workspaceId: WorkspaceId): Promise<number> {
     const doc = xml.parse('<osm><changeset></changeset></osm>');
     const changesetNode = doc.firstChild.firstChild;
     changesetNode.appendChild(xml.makeNode(doc, "tag", { k: 'workspace', v: workspaceId }));
@@ -247,7 +427,7 @@ export class OsmApiClient extends BaseHttpClient implements ICancelableClient {
 
     const body = xml.serialize(doc);
     const response = await this._put('changeset/create', body, {
-      headers: { ...this._requestHeaders, 'X-Workspace': workspaceId }
+      headers: { ...this._requestHeaders, 'X-Workspace': workspaceId },
     });
 
     return Number(await response.text());
@@ -258,11 +438,57 @@ export class OsmApiClient extends BaseHttpClient implements ICancelableClient {
       headers: {
         'Content-Type': 'application/xml',
         'Authorization': this._requestHeaders['Authorization'],
-        'X-Workspace': workspaceId
-      }
+        'X-Workspace': workspaceId,
+      },
     });
   }
 
+  async getChangesetComments(
+    workspaceId: WorkspaceId,
+    changesetId: number,
+  ): Promise<OsmChangesetComment[]> {
+    // There is no OSM API that returns comments directly. We must request the
+    // comments with the changeset:
+    //
+    const changeset = await this.getChangeset(workspaceId, changesetId, true);
+
+    return changeset?.comments ?? [];
+  }
+
+  async postChangesetComment(
+    workspaceId: WorkspaceId,
+    changesetId: number,
+    message: string,
+  ): Promise<void> {
+    const body = new FormData();
+    body.append('text', message);
+
+    await this._post(`changeset/${changesetId}/comment`, body, {
+      headers: {
+        'Authorization': this._requestHeaders['Authorization'],
+        'X-Workspace': workspaceId,
+      },
+    });
+  }
+
+  async getNotes(workspaceId: WorkspaceId, includeClosed: boolean): Promise<OsmNote[]> {
+    const params = new URLSearchParams();
+    // Fetch the maximum number of notes:
+    params.append('limit', '10000');
+    // -1: all, 0: open only, > 0: days closed:
+    params.append('closed', includeClosed ? '-1' : '0');
+
+    const response = await this._get(`notes/search.json?${params}`, {
+      headers: {
+        ...this._requestHeaders,
+        'Accept': 'application/json',
+        'X-Workspace': workspaceId,
+      },
+    });
+
+    return notesGeoJsonToEntities(await response.json());
+  }
+
   async getWorkspaceData(workspaceId: number): Promise<Array> {
     const bboxParam = await this.getExportBbox(workspaceId);
     const response = await this._get(`map.json?bbox=${bboxParam}`, {
diff --git a/services/review.ts b/services/review.ts
new file mode 100644
index 0000000..d5634bb
--- /dev/null
+++ b/services/review.ts
@@ -0,0 +1,325 @@
+import type { ChangesetManager } from '~/services/changesets';
+import type { OsmApiClient } from '~/services/osm';
+import type { TdeiClient } from '~/services/tdei';
+import type { WorkspacesClient } from '~/services/workspaces';
+import type { OsmChange, OsmChangeset, OsmNote } from '~/types/osm';
+import type { TdeiFeedback } from '~/types/tdei';
+import type { Workspace } from '~/types/workspaces';
+
+export const $CHANGESET = Symbol('changeset');
+export const $FEEDBACK = Symbol('feedback');
+export const $NOTE = Symbol('note');
+
+export type ReviewItemData = OsmChangeset | OsmNote | TdeiFeedback;
+
+export class ReviewListItem {
+  readonly type: symbol;
+  readonly key: symbol;
+  readonly data: ReviewItemData;
+
+  loadingChangeset: boolean = false;
+  oscPromise?: Promise<OsmChange>;
+
+  constructor(type: symbol, data: ReviewItemData) {
+    this.type = type;
+    this.key = Symbol();
+    this.data = data;
+  }
+
+  get id(): number {
+    return this.data.id;
+  }
+
+  get isChangeset(): boolean {
+    return this.type === $CHANGESET;
+  }
+
+  get isFeedback(): boolean {
+    return this.type === $FEEDBACK;
+  }
+
+  get isNote(): boolean {
+    return this.type === $NOTE;
+  }
+
+  get isResolved(): boolean {
+    switch (this.type) {
+      case $FEEDBACK:
+        return (this.data as TdeiFeedback).status !== 'open';
+      case $NOTE:
+        return (this.data as OsmNote).status !== 'open';
+    }
+
+    return false;
+  }
+
+  get displayType(): string {
+    switch (this.type) {
+      case $CHANGESET:
+        return 'Changeset';
+      case $FEEDBACK:
+        return 'Feedback';
+      case $NOTE:
+        return 'Note';
+    }
+
+    return 'Unknown';
+  }
+
+  get title(): string | undefined {
+    switch (this.type) {
+      case $CHANGESET:
+        return (this.data as OsmChangeset).tags?.comment || '(no comment)';
+      case $FEEDBACK:
+        return (this.data as TdeiFeedback).feedback_text;
+      case $NOTE:
+        return (this.data as OsmNote).comments[0]?.text;
+    }
+
+    return undefined;
+  }
+
+  get displayName(): string {
+    switch (this.type) {
+      case $CHANGESET:
+        return (this.data as OsmChangeset).user;
+      case $FEEDBACK:
+        return (this.data as TdeiFeedback).customer_email;
+      case $NOTE:
+        return (this.data as OsmNote).comments[0]?.user ?? 'Anonymous';
+    }
+
+    return 'Unknown';
+  }
+
+  get feedbackOverdue(): boolean {
+    return this.isFeedback
+      && (this.data as TdeiFeedback).status === 'open'
+      && (this.data as TdeiFeedback).due_date < new Date();
+  }
+
+  get hasComments(): boolean {
+    return this.commentCount > 0;
+  }
+
+  get commentCount(): number {
+    switch (this.type) {
+      case $CHANGESET:
+        return (this.data as OsmChangeset).comments_count;
+      case $NOTE:
+        return (this.data as OsmNote).comments.length - 1;
+    }
+
+    return 0;
+  }
+
+  get badgeClass(): string {
+    switch (this.type) {
+      case $CHANGESET:
+        return 'bg-dark';
+      case $FEEDBACK:
+        return 'bg-danger';
+      case $NOTE:
+        return 'bg-info';
+    }
+
+    return 'bg-secondary';
+  }
+
+  get badgeIcon(): string {
+    return this.type === $CHANGESET ? 'commit' : 'chat_bubble';
+  }
+
+  get changesetCounts() {
+    return {
+      create: (this.data as OsmChangeset).osmChange?.create?.length ?? 0,
+      modify: (this.data as OsmChangeset).osmChange?.modify?.length ?? 0,
+      delete: (this.data as OsmChangeset).osmChange?.delete?.length ?? 0,
+    };
+  }
+
+  async awaitOsmChange(promise: Promise<OsmChange>): Promise<void> {
+    this.loadingChangeset = true;
+    this.oscPromise = promise;
+    (this.data as OsmChangeset).osmChange = await promise;
+    this.loadingChangeset = false;
+  }
+}
+
+export class ReviewListFilter {
+  includeChangesets: boolean = true;
+  includeFeedback: boolean = true;
+  includeNotes: boolean = true;
+  includeResolved: boolean = false;
+  startDate: Date | undefined;
+  endDate: Date | undefined;
+  text: string | undefined;
+
+  testDates(item: ReviewItemData): boolean {
+    if (this.startDate && item.created_at < this.startDate) {
+      return false;
+    }
+    if (this.endDate && item.created_at > this.endDate) {
+      return false;
+    }
+
+    return true;
+  }
+
+  testChangeset(changeset: OsmChangeset) {
+    if (!this.testDates(changeset)) {
+      return false;
+    }
+    if (this.text && !changeset.tags?.comment?.includes(this.text)) {
+      return false;
+    }
+
+    return true;
+  }
+
+  testFeedback(feedback: TdeiFeedback) {
+    if (!this.testDates(feedback)) {
+      return false;
+    }
+    if (this.text && !feedback.feedback_text.includes(this.text)) {
+      return false;
+    }
+    if (!this.includeResolved && feedback.status !== 'open') {
+      return false;
+    }
+
+    return true;
+  }
+
+  testNote(note: OsmNote) {
+    if (!this.testDates(note)) {
+      return false;
+    }
+    if (this.text && !note.comments[0]?.text.includes(this.text)) {
+      return false;
+    }
+
+    return true;
+  }
+}
+
+function compareCreatedAtDesc(a: ReviewListItem, b: ReviewListItem) {
+  return b.data.created_at.getTime() - a.data.created_at.getTime();
+}
+
+export class ReviewList {
+  readonly #changesets: ChangesetManager;
+  readonly #osmClient: OsmApiClient;
+  readonly #tdeiClient: TdeiClient;
+  readonly #workspacesClient: WorkspacesClient;
+
+  readonly workspaceId: number;
+  readonly items: ReviewListItem[] = [];
+
+  workspace?: Workspace;
+
+  constructor(
+    changesets: ChangesetManager,
+    osmClient: OsmApiClient,
+    tdeiClient: TdeiClient,
+    workspacesClient: WorkspacesClient,
+    workspaceId: number,
+  ) {
+    this.#changesets = changesets;
+    this.#osmClient = osmClient;
+    this.#tdeiClient = tdeiClient;
+    this.#workspacesClient = workspacesClient;
+    this.workspaceId = workspaceId;
+  }
+
+  async refresh(filter: ReviewListFilter) {
+    this.items.length = 0;
+    const [changesets, feedback, notes] = await this.#fetchLists(filter);
+
+    for (const changeset of changesets) {
+      if (filter.testChangeset(changeset)) {
+        this.items.push(new ReviewListItem($CHANGESET, changeset));
+      }
+    }
+
+    for (const submission of feedback) {
+      if (filter.testFeedback(submission)) {
+        this.items.push(new ReviewListItem($FEEDBACK, submission));
+      }
+    }
+
+    for (const note of notes) {
+      if (filter.testNote(note)) {
+        this.items.push(new ReviewListItem($NOTE, note));
+      }
+    }
+
+    this.items.sort(compareCreatedAtDesc);
+  }
+
+  async loadOsmChange(item: ReviewListItem) {
+    if (!item.isChangeset) {
+      return;
+    }
+
+    const changeset = item.data as OsmChangeset;
+    item.awaitOsmChange(this.#changesets.getOsc(this.workspaceId, changeset));
+  }
+
+  async #fetchLists(filter: ReviewListFilter) {
+    const changesetPromise = filter.includeChangesets
+      ? this.#osmClient.listChangesets(this.workspaceId)
+      : Promise.resolve([]);
+    const notePromise = filter.includeNotes
+      ? this.#osmClient.getNotes(this.workspaceId, filter.includeResolved)
+      : Promise.resolve([]);
+
+    if (!this.workspace) {
+      this.workspace = await this.#workspacesClient.getWorkspace(this.workspaceId);
+    }
+
+    const feedbackPromise = filter.includeFeedback && this.workspace?.tdeiRecordId
+      ? this.#tdeiClient.getDatasetFeedback(this.workspace.tdeiRecordId, filter.includeResolved)
+      : Promise.resolve([]);
+
+    return await Promise.all([
+      changesetPromise,
+      feedbackPromise,
+      notePromise,
+    ]);
+  }
+}
+
+export class ReviewManager {
+  readonly #changesets: ChangesetManager;
+  readonly #osmClient: OsmApiClient;
+  readonly #tdeiClient: TdeiClient;
+  readonly #workspacesClient: WorkspacesClient;
+
+  constructor(
+    changesets: ChangesetManager,
+    osmClient: OsmApiClient,
+    tdeiClient: TdeiClient,
+    workspacesClient: WorkspacesClient,
+  ) {
+    this.#changesets = changesets;
+    this.#osmClient = osmClient;
+    this.#tdeiClient = tdeiClient;
+    this.#workspacesClient = workspacesClient;
+  }
+
+  getList(workspaceId: number): ReviewList {
+    return new ReviewList(
+      this.#changesets,
+      this.#osmClient,
+      this.#tdeiClient,
+      this.#workspacesClient,
+      workspaceId,
+    );
+  }
+
+  getFilter(): ReviewListFilter {
+    // TODO: enable saving/loading filters
+    return new ReviewListFilter();
+  }
+}
diff --git a/services/tdei.ts b/services/tdei.ts
index 09895d3..6f0535d 100644
--- a/services/tdei.ts
+++ b/services/tdei.ts
@@ -2,6 +2,7 @@ import { BlobReader, BlobWriter, ZipReader } from '@zip.js/zip.js';
 
 import { BaseHttpClient, BaseHttpClientError } from '~/services/http';
 import type { ICancelableClient } from '~/services/loading';
+import type { TdeiFeedback } from '~/types/tdei.ts';
 
 const MIN_TOKEN_REFRESH_MS = 10 * 1000;
 
@@ -343,6 +344,39 @@ export class TdeiClient extends BaseHttpClient implements ICancelableClient {
     return await fileResponse.blob();
   }
 
+  async getDatasetFeedback(
+    tdeiDatasetId: string,
+    showResolved: boolean = false,
+  ): Promise<TdeiFeedback[]> {
+    const feedback = [];
+    const pageSize = 50;
+    const pageNum = 1;
+    let items;
+
+    const params = new URLSearchParams();
+    params.append('tdei_dataset_id', tdeiDatasetId);
+    params.append('page_size', pageSize.toString());
+
+    if (!showResolved) {
+      params.append('status', 'open');
+    }
+
+    do {
+      params.set('page_no', pageNum.toString());
+      const response = await this._get(`osw/dataset-viewer/feedbacks?${params}`);
+      items = (await response.json()) ?? [];
+
+      for (const submission of items) {
+        submission.created_at = new Date(submission.created_at);
+        submission.updated_at = new Date(submission.updated_at);
+        submission.due_date = new Date(submission.due_date);
+        feedback.push(submission);
+      }
+    } while (items.length === pageSize);
+
+    return feedback;
+  }
+
   #setAuth(username: string, body: any) {
     const jwt = getJwtBody(body.access_token);
 
diff --git a/types/adiff.ts b/types/adiff.ts
new file mode 100644
index 0000000..2639599
--- /dev/null
+++ b/types/adiff.ts
@@ -0,0 +1,30 @@
+import type {
+  OsmChangeActionType,
+  OsmNode,
+  OsmWay,
+} from '~/types/osm';
+
+export type AdiffNode = OsmNode;
+
+export interface AdiffWayNodeRef {
+  ref: number;
+  lat: number;
+  lon: number;
+};
+
+export interface AdiffWay extends Omit<OsmWay, 'nodes'> {
+  nodes: AdiffWayNodeRef[];
+}
+
+export type AdiffElement = AdiffNode | AdiffWay;
+export type AdiffActionType = OsmChangeActionType;
+
+export interface AdiffAction {
+  type: AdiffActionType;
+  new: AdiffElement;
+  old?: AdiffElement;
+}
+
+export interface AugmentedDiff {
+  actions: AdiffAction[];
+}
diff --git a/types/maplibre-adiff-viewer.d.ts b/types/maplibre-adiff-viewer.d.ts
new file mode 100644
index 0000000..507417d
--- /dev/null
+++ b/types/maplibre-adiff-viewer.d.ts
@@ -0,0 +1 @@
+declare module '@osmcha/maplibre-adiff-viewer';
diff --git a/types/osm.ts b/types/osm.ts
new file mode 100644
index 0000000..7282618
--- /dev/null
+++ b/types/osm.ts
@@ -0,0 +1,91 @@
+export const OSM_ELEMENT_TYPES = ['node', 'way', 'relation'] as const;
+export type OsmElementType = typeof OSM_ELEMENT_TYPES[number];
+
+export type OsmTags = Record<string, string>;
+export type OsmRelationRef = { type: OsmElementType; ref: number; role: string };
+
+interface BaseElement {
+  id: number;
+  visible?: boolean;
+  version: number;
+  changeset: number;
+  timestamp: Date;
+  user: string;
+  uid: number;
+  type: OsmElementType;
+  tags: OsmTags;
+};
+
+export interface OsmNode extends BaseElement {
+  type: 'node';
+  lat: number;
+  lon: number;
+};
+
+export interface OsmWay extends BaseElement {
+  type: 'way';
+  nodes: number[];
+};
+
+export interface OsmRelation extends BaseElement {
+  type: 'relation';
+  members: OsmRelationRef[];
+};
+
+export type OsmElement = OsmNode | OsmWay | OsmRelation;
+
+export const OSMCHANGE_ACTION_TYPES = ['create', 'modify', 'delete'] as const;
+type OsmChangeActionTypeTuple = typeof OSMCHANGE_ACTION_TYPES;
+export type OsmChangeActionType = OsmChangeActionTypeTuple[number];
+
+export type OsmChange = {
+  [K in OsmChangeActionType]: OsmElement[] | undefined;
+};
+
+export interface OsmChangesetComment {
+  id: number;
+  text: string;
+  visible: boolean;
+  user: string;
+  uid: string;
+  date: Date;
+};
+
+export interface OsmChangeset {
+  id: number;
+  created_at: Date;
+  closed_at: Date;
+  open: boolean;
+  user: string;
+  uid: number;
+  min_lat: number;
+  min_lon: number;
+  max_lat: number;
+  max_lon: number;
+  comments_count: number;
+  changes_count: number;
+  tags: OsmTags;
+  comments?: OsmChangesetComment[];
+  osmChange: OsmChange; // Workspaces only
+};
+
+export type OsmNoteStatus = 'open' | 'closed';
+export type OsmNoteAction = 'opened' | 'closed' | 'commented' | 'reopened';
+
+export interface OsmNoteComment {
+  action: OsmNoteAction;
+  date: Date;
+  user?: string;
+  uid?: number;
+  text: string;
+  html: string;
+}
+
+export interface OsmNote {
+  id: number;
+  status: OsmNoteStatus;
+  lat: number;
+  lon: number;
+  created_at: Date;
+  comments: OsmNoteComment[];
+}
diff --git a/types/osmchange-parser.d.ts b/types/osmchange-parser.d.ts
new file mode 100644
index 0000000..c216004
--- /dev/null
+++ b/types/osmchange-parser.d.ts
@@ -0,0 +1 @@
+declare module '@osmcha/osmchange-parser';
diff --git a/types/tdei.ts b/types/tdei.ts
new file mode 100644
index 0000000..3a01edd
--- /dev/null
+++ b/types/tdei.ts
@@ -0,0 +1,26 @@
+export interface TdeiProjectGroupItem {
+  tdei_project_group_id: string;
+  name: string;
+}
+
+export interface TdeiDatasetItem {
+  tdei_dataset_id: string;
+  name: string;
+}
+
+export interface TdeiFeedback {
+  id: number;
+  status: string;
+  location_latitude: number;
+  location_longitude: number;
+  customer_email: string;
+  feedback_text: string;
+  created_at: Date;
+  updated_at: Date;
+  due_date: Date;
+  resolution_status: string | null;
+  resolution_description: string | null;
+  resolved_by: string | null;
+  project_group: TdeiProjectGroupItem;
+  dataset: TdeiDatasetItem;
+}
diff --git a/types/workspaces.ts b/types/workspaces.ts
new file mode 100644
index 0000000..ff9a61f
--- /dev/null
+++ b/types/workspaces.ts
@@ -0,0 +1,20 @@
+
+export type WorkspaceId = number;
+export type WorkspaceType = 'osw' | 'pathways';
+export type WorkspaceAppAccess = 0 | 1 | 2;
+
+export interface Workspace {
+  id: WorkspaceId;
+  type: WorkspaceType;
+  title: string;
+  description?: string;
+  tdeiRecordId?: string;
+  tdeiProjectGroupId: string;
+  tdeiServiceId?: string;
+  tdeiMetadata?: string;
+  createdAt: Date;
+  createdBy: string;
+  createdByName: string;
+  externalAppAccess: WorkspaceAppAccess;
+  kartaViewToken?: string;
+}
diff --git a/util/time.ts b/util/time.ts
new file mode 100644
index 0000000..a347d2b
--- /dev/null
+++ b/util/time.ts
@@ -0,0 +1,17 @@
+import dayjs from 'dayjs';
+import relativeTime from 'dayjs/plugin/relativeTime';
+
+dayjs.extend(relativeTime);
+
+const shortFormatter = new Intl.DateTimeFormat(undefined, {
+  dateStyle: 'short',
+  timeStyle: 'short',
+});
+
+export function formatShort(date: Date): string {
+  return shortFormatter.format(date);
+}
+
+export function formatElapsed(date: Date): string {
+  return dayjs(date).fromNow();
+}