Windmill
An open-source developer platform that turns scripts into webhooks, workflows and internal UIs.
Sources and review
Checked against public documentation on . Suitability guidance is our editorial judgment; this is not a performance benchmark or an endorsement.
Engineering teams building internal automations and AI workflows as code with auto-generated UIs.
About Windmill
Windmill is a self-hostable platform for APIs, background jobs, workflows and internal apps. Scripts in Python, TypeScript, Go, Bash, SQL, GraphQL, PowerShell, Rust and more become shareable UIs automatically and compose into flows or low-code apps, positioning it as an alternative to Retool, Pipedream and a simplified Temporal. The code is AGPLv3 and Apache-2.0, with proprietary enterprise features.
Windmill is listed in this index written primarily in Rust, with 18k stars on GitHub. Its latest recorded repository push was in November 2026; that is not an ASE editorial review date.
Windmill and related category tools
Alternatives guide →| Record | Stars | Pricing | ||
|---|---|---|---|---|
| Windmillthis listing | 18k | Rust | AGPL-3.0 | Costs not checked |
| Tale | 40 | — | MIT | Costs not checked |
| activepieces | 25k | TypeScript | — | Costs not checked |
| dify | 160k | TypeScript | — | Community hosting/model costs; Cloud plans |
| Gumloop | — | — | — | Freemium |
| Sim | 30k | TypeScript | Apache-2.0 | Costs not checked |
