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