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Structurizr vs D2: catalog facts
Structurizr	D2
Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…	Free Free and open source under the Mozilla Public License 2.0.
Web, Self-hosted	Windows, Command line
Reference implementation of the C4 model Many diagrams generated from one text model	Diagrams as text that fit into version control Simple syntax with automatic layout
Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL	Requires learning the D2 syntax Less fine control than drawing by hand
Web application, Self-hosted	Downloadable app
Open source	Open source
License: Apache-2.0	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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