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D2 vs Structurizr: catalog facts
D2	Structurizr
Free Free and open source under the Mozilla Public License 2.0.	Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…
Windows, Command line	Web, Self-hosted
Diagrams as text that fit into version control Simple syntax with automatic layout	Reference implementation of the C4 model Many diagrams generated from one text model
Requires learning the D2 syntax Less fine control than drawing by hand	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: MPL-2.0	License: Apache-2.0
No account needed	No account needed
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 2, 2026

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