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Umbrello vs PlantUML: catalog facts
Umbrello	PlantUML
Free Free and open source under the GPL-2.0 or later.	Free Free and open source under the GPL.
Windows, Linux	Windows, macOS, Linux, Web, Command line
Supports nine UML and ER diagram types Generates code from diagrams in several languages	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma	Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0
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 September 22, 2026

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