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StarUML vs Gaphor: catalog facts
StarUML	Gaphor
Paid Commercial software; see the website for licence options.	Free The software is free under its open-source licence. Hosting, hardware and external…
macOS	Windows, macOS, Linux
Covers most UML 2 diagram types Mixes UML, ERD, SysML, BPMN and more in one project	It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…
Commercial licence Closed source	It is a modelling tool rather than a quick diagram editor, and it does not generate code from…
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
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.