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Gaphor vs UMLet: catalog facts
Gaphor	UMLet
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.
Windows, macOS, Linux	Windows, macOS, Linux, Web
It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…	Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools
Downloadable app	Downloadable app, Web application
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
Not stated if an account is needed	No account 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 2, 2026

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