Compare software

nomnoml vs D2: catalog facts
nomnoml	D2
Free Free and open source under the MIT licence.	Free Free and open source under the Mozilla Public License 2.0.
Web, Command line	Windows, Command line
Readable syntax that resembles the drawn diagram Instant live preview in the browser	Diagrams as text that fit into version control Simple syntax with automatic layout
Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML	Requires learning the D2 syntax Less fine control than drawing by hand
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	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.