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Semaphore UI vs Windmill: catalog facts
Semaphore UI	Windmill
Free The open-source software is available without a license fee. Hosting, hardware and…	Freemium Open-source self-hosted version is free; a hosted cloud and an enterprise edition are…
Self-hosted, Web	Web, Self-hosted
Organizes reusable tasks for Ansible and other deployment tools.	Scripts become APIs, jobs and forms without boilerplate Supports TypeScript, Python, Go, Bash and 20+ other languages
Requires a server and configured automation tools.	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: MIT	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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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