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Umbrello vs Astah Professional: catalog facts
Umbrello	Astah Professional
Free Free and open source under the GPL-2.0 or later.	Paid Commercial license with a free trial and student options.
Windows, Linux	macOS
Supports nine UML and ER diagram types Generates code from diagrams in several languages	UML, ERD, DFD and flowcharts in one tool API and free plugins for customisation
No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma	Paid license after the trial Focused on software modelling rather than general diagramming
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0-or-later	License not stated
No account needed	Not stated if an account is 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.