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Mermaid vs Structurizr: catalog facts
Mermaid	Structurizr
Free Free and open source under the MIT licence.	Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…
Web, Command line	Web, Self-hosted
Diagrams are plain text, so they diff and review like code Rendered natively by GitHub, GitLab and most documentation generators	Reference implementation of the C4 model Many diagrams generated from one text model
Layout is automatic, so fine control over positioning is limited Complex diagrams become hard to read in source form	Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL
Web application, Downloadable app	Web application, Self-hosted
Open source	Open source
License: MIT	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.