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Structurizr vs Overarch: catalog facts
Structurizr	Overarch
Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…	Free Free and open source under the EPL-1.0 license.
Web, Self-hosted	Command line
Reference implementation of the C4 model Many diagrams generated from one text model	Supports C4 and several UML diagram types Separates architecture models from their views
Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL	Uses data files to define models and views
Web application, Self-hosted	Downloadable app
Open source	Open source
License: Apache-2.0	License: EPL-1.0
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 October 8, 2026

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