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nomnoml vs PlantUML: catalog facts
nomnoml	PlantUML
Free Free and open source under the MIT licence.	Free Free and open source under the GPL.
Web, Command line	Windows, macOS, Linux, Web, Command line
Readable syntax that resembles the drawn diagram Instant live preview in the browser	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML	Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	Not stated if an account is 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 September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.