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Umbrello vs UMLet: catalog facts
Umbrello	UMLet
Free Free and open source under the GPL-2.0 or later.	Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.
Windows, Linux	Windows, macOS, Linux, Web
Supports nine UML and ER diagram types Generates code from diagrams in several languages	Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard
No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma	Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0-or-later
No account 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 2, 2026

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