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WebSequenceDiagramsPlantUML
Free

Described on its site as a free online tool.

 Free

Free and open source under the GPL.

Web Windows, macOS, Linux, Web, Command line
  • Diagrams are written as plain text instead of drawn by hand
  • Runs in the browser with nothing to install
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Only draws sequence diagrams
  • Little public detail on export options and paid features
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
Web application Downloadable app, Web application
Closed source Open source
License not stated License: GPL-3.0
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 October 2, 2026

Checked September 22, 2026

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