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IcePanel vs PlantUML: catalog facts
IcePanel	PlantUML
Freemium Self-serve sign-up, with paid plans listed on the pricing page and demos for larger teams.	Free Free and open source under the GPL.
Web	Windows, macOS, Linux, Web, Command line
Built around the C4 model for software architecture Interactive model rather than static drawings	Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system
Aimed at software teams rather than general diagramming Online only with an account	Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types
Web application	Downloadable app, Web application
Closed source	Open source
License not stated	License: GPL-3.0
Account needed	Not stated if an account is needed
Not stated if it 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.