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StarUML vs Umbrello: catalog facts
StarUML	Umbrello
Paid Commercial software; see the website for licence options.	Free Free and open source under the GPL-2.0 or later.
macOS	Windows, Linux
Covers most UML 2 diagram types Mixes UML, ERD, SysML, BPMN and more in one project	Supports nine UML and ER diagram types Generates code from diagrams in several languages
Commercial licence Closed source	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
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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