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Gaphor vs PlantUML: catalog facts
Gaphor	PlantUML
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows, macOS, Linux, Web, Command line
It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types
Downloadable app	Downloadable app, Web application
Open source	Open source
License: Apache-2.0	License: GPL-3.0
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.