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Kroki vs nomnoml: catalog facts
Kroki	nomnoml
Free The public kroki.io service and interactive editor are free to use.	Free Free and open source under the MIT licence.
Web, Self-hosted	Web, Command line
One API for dozens of text-based diagram languages Live in-browser editor for trying each format	Readable syntax that resembles the drawn diagram Instant live preview in the browser
Aimed at developers and documentation tooling rather than freehand drawing Each diagram language has its own syntax to learn	Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML
Web application, Self-hosted, Hosted service	Downloadable app, Web application
Closed source	Open source
License not stated	License: MIT
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.