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Ilograph vs D2: catalog facts
Ilograph	D2
Freemium New diagrams can be created online; on-prem and Confluence Cloud editions are separate…	Free Free and open source under the Mozilla Public License 2.0.
Web, Self-hosted	Windows, Command line
Zoomable views from overview to component level Interactive sequence diagrams for flows	Diagrams as text that fit into version control Simple syntax with automatic layout
Learning the diagram language takes some time Focused on system architecture rather than general drawing	Requires learning the D2 syntax Less fine control than drawing by hand
Web application, Self-hosted	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
Not stated if an account is 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.