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UMLet vs PlantUML: catalog facts
UMLet	PlantUML
Free Free and open source; donations are accepted through GitHub Sponsors, Patreon and PayPal.	Free Free and open source under the GPL.
Windows, macOS, Linux, Web	Windows, macOS, Linux, Web, Command line
Sequence and activity diagrams can be created from plain text Exports to EPS, PDF, JPG, SVG and the clipboard	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
Focused on drawing diagrams rather than full model-driven design Plain interface may feel basic next to commercial modelling tools	Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: GPL-3.0-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 2, 2026	Official website Full listing and sources Checked September 22, 2026

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