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the catalog · 🤖 Automation

Windmill

★ 15k

Turns Python/TypeScript/Go/SQL scripts into workflows, cron jobs, and internal apps with a low-code UI builder

Windmill does the job of Zapier, Retool and Airplane, self-hosted. It is AGPL-licensed, so a hosted fork has to publish its changes, and setting it up is an afternoon, not a weekend. Zapier bills $20-100+ for it. 15k stars on GitHub.

Open-source replacement for Zapier, Retool, Airplane.

Licence
AGPL-3.0 (+EE)
Self-hosting
Medium
The paid one costs
$20-100+
GitHub stars
15k
view the code →official site →

Is it actually a replacement?

We have written a verdict on what it replaces — what you lose, and why people still pay:

How Windmill runs

Where it runs

Windmill runs on your server.

What setup takes

not verified by us yet — check the repo README.

Windmill questions

Is Windmill open source?

Yes — it is released under AGPL-3.0 (+EE).

Can Windmill replace Zapier?

Our verdict on Zapier is YES. n8n (130k stars), MCP Servers (89k stars), Activepieces Community Edition (24k stars) are mature open-source replacements for Zapier — self-host in one command and stop paying $29.99/mo.

Can I self-host Windmill?

Yes — we rate it medium to self-host, and it runs on your server.

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