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nomnoml vs Kroki: catalog facts
nomnoml	Kroki
Free Free and open source under the MIT licence.	Free The public kroki.io service and interactive editor are free to use.
Web, Command line	Web, Self-hosted
Readable syntax that resembles the drawn diagram Instant live preview in the browser	One API for dozens of text-based diagram languages Live in-browser editor for trying each format
Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML	Aimed at developers and documentation tooling rather than freehand drawing Each diagram language has its own syntax to learn
Downloadable app, Web application	Web application, Self-hosted, Hosted service
Open source	Closed source
License: MIT	License not stated
No account needed	No account 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.