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nomnoml vs Umbrello: catalog facts
nomnoml	Umbrello
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-2.0 or later.
Web, Command line	Windows, Linux
Readable syntax that resembles the drawn diagram Instant live preview in the browser	Supports nine UML and ER diagram types Generates code from diagrams in several languages
Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML	No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0-or-later
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 1, 2026

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