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Astah UMLPlantUML
Paid

Paid license with a free trial and student options.

 Free

Free and open source under the GPL.

macOS Windows, macOS, Linux, Web, Command line
  • Focused on UML without extra complexity
  • Mind mapping included
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Paid after the trial
  • SysML and other modeling require separate editions
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
Downloadable app 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.