Compare software

Gaphor vs Astah Professional: catalog facts
Gaphor	Astah Professional
Free The software is free under its open-source licence. Hosting, hardware and external…	Paid Commercial 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…	UML, ERD, DFD and flowcharts in one tool API and free plugins for customisation
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	Paid license after the trial Focused on software modelling rather than general diagramming
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.