Compare software

SequenceDiagram.orgPlantUML
Free

Free to use, supported by optional Patreon donations.

 Free

Free and open source under the GPL.

Web Windows, macOS, Linux, Web, Command line
  • Text notation and drag and drop editing in one tool
  • Saves to local files, Google Drive, OneDrive or browser storage
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Only draws sequence diagrams
  • No built-in real-time collaboration mentioned
  • 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
No account 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.