Compare software

Graphviz vs nomnoml: catalog facts
Graphviz	nomnoml
Free Free and open source.	Free Free and open source under the MIT licence.
Windows, Command line	Web, Command line
Diagrams generated automatically from plain text Exports to PNG, SVG, PDF and PostScript	Readable syntax that resembles the drawn diagram Instant live preview in the browser
Requires learning the DOT language Limited manual control over automatic layouts	Web editor stores diagrams only in browser local storage Smaller range of diagram types than PlantUML
Downloadable app	Downloadable app, Web application
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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