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PlantUML vs Swimlanes.io: catalog facts
PlantUML	Swimlanes.io
Free Free and open source under the GPL.	Free Free to use.
Windows, macOS, Linux, Web, Command line	Web
Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system	Live preview while typing Share a diagram just by copying the URL
Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types	Only draws sequence diagrams The share URL changes with every edit
Downloadable app, Web application	Web application
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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