Umple is a suite of technologies for:
- Modeling software using data models (class diagrams), state models and others; the models can be edited textually or graphically
- Analysing models (finding errors, linting)
- Embedding action code in models using Java, Python, PhP, C++ and Rubyu
- Organizing code using a variety of separation of concerns mechanisms (traits, mixins, mixsets, aspects)
- Generating code in ny of the above languages to create libraries or complete systems
- Generating diagrams, examples, and many other artifacts
The main web page of Umple is https://www.umple.org
The following are the core repositories:
- umple: This contains the compiler and UmpleOnline, the online version of umple accessible live at https://try.umple.org
- umple-lsp: The language server protocol for Umple, used by IDEs and text editors. It uses the compiler above to analyze models
- umple.vscode: VSCode plugin for Umple (newly updated in 2026 to use umple-lsp).
- umple.zed: Zed plugin for Umple (new as of early 2026).
- More key repos to be added here later
The Umple user manual is at https://manual.umple.org
For comprehensive information such as the issue tracker, wiki, governance and contribution guidelines, see the main Umple repository
Umple is mostly developed by students (mostly 4th year, Masters and PhD students).
Umple is supported by grants from NSERC and infrastructure from the Digital Research Alliance of Canada. Umple has also received corporate support over the years various sources including IBM.
