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Gaphor vs Umbrello: catalog facts
Gaphor	Umbrello
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under the GPL-2.0 or later.
Windows, macOS, Linux	Windows, Linux
It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…	Supports nine UML and ER diagram types Generates code from diagrams in several languages
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-2.0-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 1, 2026

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