Compare software

PlantUMLStarUML
Free

Free and open source under the GPL.

 Paid

Commercial software; see the website for licence options.

Windows, macOS, Linux, Web, Command line macOS
  • Covers far more diagram types than most text-based tools
  • Integrations for nearly every editor, wiki and documentation system
  • Covers most UML 2 diagram types
  • Mixes UML, ERD, SysML, BPMN and more in one project
  • Requires Java and, for some diagram types, Graphviz
  • The syntax is inconsistent between diagram types
  • Commercial licence
  • Closed source
Downloadable app, Web application Downloadable app
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 Works offline

Checked September 22, 2026

Checked October 1, 2026

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