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PlantUML vs IcePanel: catalog facts
PlantUML	IcePanel
Free Free and open source under the GPL.	Freemium Self-serve sign-up, with paid plans listed on the pricing page and demos for larger teams.
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	Built around the C4 model for software architecture Interactive model rather than static drawings
Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types	Aimed at software teams rather than general diagramming Online only with an account
Downloadable app, Web application	Web application
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	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.