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Structurizr vs PlantUML: catalog facts
Structurizr	PlantUML
Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…	Free Free and open source under the GPL.
Web, Self-hosted	Windows, macOS, Linux, Web, Command line
Reference implementation of the C4 model Many diagrams generated from one text model	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL	Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types
Web application, Self-hosted	Downloadable app, Web application
Open source	Open source
License: Apache-2.0	License: GPL-3.0
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.