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Windmill vs Semaphore UI: catalog facts
Windmill	Semaphore UI
Freemium Open-source self-hosted version is free; a hosted cloud and an enterprise edition are…	Free The open-source software is available without a license fee. Hosting, hardware and…
Web, Self-hosted	Self-hosted, Web
Scripts become APIs, jobs and forms without boilerplate Supports TypeScript, Python, Go, Bash and 20+ other languages	Organizes reusable tasks for Ansible and other deployment tools.
Aimed at teams comfortable writing code Some features are tied to the enterprise edition	Requires a server and configured automation tools.
Self-hosted, Hosted service	Self-hosted
Open source	Open source
License not stated	License: MIT
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 22, 2026

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