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PlantUMLWebSequenceDiagrams
Free

Free and open source under the GPL.

 Free

Described on its site as a free online tool.

Windows, macOS, Linux, Web, Command line Web
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Diagrams are written as plain text instead of drawn by hand
  • Runs in the browser with nothing to install
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
  • Only draws sequence diagrams
  • Little public detail on export options and paid features
Downloadable app, Web application Web application
Open source Closed source
License: GPL-3.0 License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.