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Kroki vs D2: catalog facts
Kroki	D2
Free The public kroki.io service and interactive editor are free to use.	Free Free and open source under the Mozilla Public License 2.0.
Web, Self-hosted	Windows, Command line
One API for dozens of text-based diagram languages Live in-browser editor for trying each format	Diagrams as text that fit into version control Simple syntax with automatic layout
Aimed at developers and documentation tooling rather than freehand drawing Each diagram language has its own syntax to learn	Requires learning the D2 syntax Less fine control than drawing by hand
Web application, Self-hosted, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
No account 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.