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nomnoml vs UMLet: catalog facts
nomnoml	UMLet
Free Free and open source under the MIT licence.	Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.
Web, Command line	Windows, macOS, Linux, Web
Readable syntax that resembles the drawn diagram Instant live preview in the browser	Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard
Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML	Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: MIT	License: GPL-3.0-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 2, 2026

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