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Gaphor vs Structurizr: catalog facts
Gaphor	Structurizr
Free The software is free under its open-source licence. Hosting, hardware and external…	Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…
Windows, macOS, Linux	Web, Self-hosted
It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…	Reference implementation of the C4 model Many diagrams generated from one text model
It is a modelling tool rather than a quick diagram editor, and it does not generate code from…	Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL
Downloadable app	Web application, Self-hosted
Open source	Open source
License: Apache-2.0	License: Apache-2.0
Not stated if an account is needed	No account 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.