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StackStorm vs Windmill: catalog facts
StackStorm	Windmill
Free Free and open source.	Freemium Open-source self-hosted version is free; a hosted cloud and an enterprise edition are…
Self-hosted	Web, Self-hosted
Event-driven rules as well as multi-step workflows Integrates with existing tools and processes	Scripts become APIs, jobs and forms without boilerplate Supports TypeScript, Python, Go, Bash and 20+ other languages
A server platform that takes work to deploy and maintain Aimed at operations teams rather than individual users	Aimed at teams comfortable writing code Some features are tied to the enterprise edition
Self-hosted	Self-hosted, Hosted service
Open source	Open source
License not stated	License not stated
Not stated if an account is 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 September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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