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Structurizr vs Ilograph: catalog facts
Structurizr	Ilograph
Freemium Open source under Apache-2.0; the documentation includes a pricing page for the server…	Freemium New diagrams can be created online; on-prem and Confluence Cloud editions are separate…
Web, Self-hosted	Web, Self-hosted
Reference implementation of the C4 model Many diagrams generated from one text model	Zoomable views from overview to component level Interactive sequence diagrams for flows
Focused on the C4 model rather than general diagramming Requires learning the Structurizr DSL	Learning the diagram language takes some time Focused on system architecture rather than general drawing
Web application, Self-hosted	Web application, Self-hosted
Open source	Closed source
License: Apache-2.0	License not stated
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 2, 2026

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