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Structurizr vs Gaphor: catalog facts
Structurizr	Gaphor
Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…	Free The software is free under its open-source licence. Hosting, hardware and external…
Web, Self-hosted	Windows, macOS, Linux
Reference implementation of the C4 model Many diagrams generated from one text model	It keeps a real UML 2 data model behind the diagrams, so elements are reused across views rather…
Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL	It is a modelling tool rather than a quick diagram editor, and it does not generate code from…
Web application, Self-hosted	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0
No account 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 October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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