Compare software

nomnoml vs Graphviz: catalog facts
nomnoml	Graphviz
Free Free and open source under the MIT licence.	Free Free and open source.
Web, Command line	Windows, Command line
Readable syntax that resembles the drawn diagram Instant live preview in the browser	Diagrams generated automatically from plain text Exports to PNG, SVG, PDF and PostScript
Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML	Requires learning the DOT language Limited manual control over automatic layouts
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	License not stated
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.