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