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Prefect vs Windmill: catalog facts
Prefect	Windmill
Freemium Open source core is free; the hosted platform has a free start and paid plans.	Freemium Open-source self-hosted version is free; a hosted cloud and an enterprise edition are…
Web, Self-hosted, Command line	Web, Self-hosted
Plain Python decorators define flows and tasks Built-in retries and scheduling	Scripts become APIs, jobs and forms without boilerplate Supports TypeScript, Python, Go, Bash and 20+ other languages
Aimed at Python users Some features belong to the paid hosted platform	Aimed at teams comfortable writing code Some features are tied to the enterprise edition
Self-hosted, Hosted service	Self-hosted, Hosted service
Open source	Open source
License: Apache-2.0	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.