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PlantUML vs Astah UML: catalog facts
PlantUML	Astah UML
Free Free and open source under the GPL.	Paid Paid license with a free trial and student 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	Focused on UML without extra complexity Mind mapping included
Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types	Paid after the trial SysML and other modeling require separate editions
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	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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