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Gaphor vs Astah UML: catalog facts
Gaphor	Astah UML
Free The software is free under its open-source licence. Hosting, hardware and external…	Paid Paid license with a free trial and student options.
Windows, macOS, Linux	macOS
It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…	Focused on UML without extra complexity Mind mapping included
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	Paid after the trial SysML and other modeling require separate editions
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	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.