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PlantUML vs Kroki: catalog facts
PlantUML	Kroki
Free Free and open source under the GPL.	Free The public kroki.io service and interactive editor are free to use.
Windows, macOS, Linux, Web, Command line	Web, Self-hosted
Covers far more diagram types than most text-based tools Integrations for nearly every editor, wiki and documentation system	One API for dozens of text-based diagram languages Live in-browser editor for trying each format
Requires Java and, for some diagram types, Graphviz The syntax is inconsistent between diagram types	Aimed at developers and documentation tooling rather than freehand drawing Each diagram language has its own syntax to learn
Downloadable app, Web application	Web application, Self-hosted, Hosted service
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.