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PlantUML vs Umbrello: catalog facts
PlantUML	Umbrello
Free Free and open source under the GPL.	Free Free and open source under the GPL-2.0 or later.
Windows, macOS, Linux, Web, Command line	Windows, Linux
Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system	Supports nine UML and ER diagram types Generates code from diagrams in several languages
Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types	No macOS build listed Interface follows KDE conventions that may feel unfamiliar outside Plasma
Downloadable app, Web application	Downloadable app
Open source	Open source
License: GPL-3.0	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 September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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