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PlantUML vs Gaphor: catalog facts
PlantUML	Gaphor
Free Free and open source under the GPL.	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux, Web, Command line	Windows, macOS, Linux
Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system	It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…
Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types	It is a modelling tool rather than a quick diagram editor, and it does not generate code from…
Downloadable app, Web application	Downloadable app
Open source	Open source
License: GPL-3.0	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 September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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