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Windmill vs Prefect: catalog facts
Windmill	Prefect
Freemium Open-source self-hosted version is free; a hosted cloud and an enterprise edition are…	Freemium Open source core is free; the hosted platform has a free start and paid plans.
Web, Self-hosted	Web, Self-hosted, Command line
Scripts become APIs, jobs and forms without boilerplate Supports TypeScript, Python, Go, Bash and 20+ other languages	Plain Python decorators define flows and tasks Built-in retries and scheduling
Aimed at teams comfortable writing code Some features are tied to the enterprise edition	Aimed at Python users Some features belong to the paid hosted platform
Self-hosted, Hosted service	Self-hosted, Hosted service
Open source	Open source
License not stated	License: Apache-2.0
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.