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Astah Professional vs Gaphor: catalog facts
Astah Professional	Gaphor
Paid Commercial license with a free trial and student options.	Free The software is free under its open-source licence. Hosting, hardware and external…
macOS	Windows, macOS, Linux
UML, ERD, DFD and flowcharts in one tool API and free plugins for customisation	It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…
Paid license after the trial Focused on software modelling rather than general diagramming	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
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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