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Gaphor vs StarUML: catalog facts
Gaphor	StarUML
Free The software is free under its open-source licence. Hosting, hardware and external…	Paid Commercial software; see the website for licence options.
Windows, macOS, Linux	macOS
It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…	Covers most UML 2 diagram types Mixes UML, ERD, SysML, BPMN and more in one project
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	Commercial licence Closed source
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	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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