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StarUML vs PlantUML: catalog facts
StarUML	PlantUML
Paid Commercial software; see the website for licence options.	Free Free and open source under the GPL.
macOS	Windows, macOS, Linux, Web, Command line
Covers most UML 2 diagram types Mixes UML, ERD, SysML, BPMN and more in one project	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
Commercial licence Closed source	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
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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