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Umbrello vs StarUML: catalog facts
Umbrello	StarUML
Free Free and open source under the GPL-2.0 or later.	Paid Commercial software; see the website for licence options.
Windows, Linux	macOS
Supports nine UML and ER diagram types Generates code from diagrams in several languages	Covers most UML 2 diagram types Mixes UML, ERD, SysML, BPMN and more in one project
No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma	Commercial licence Closed source
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	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.