Windmill

Open-source platform that turns scripts into workflows, UIs, and scheduled jobs.

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What is Windmill?

Windmill is an open-source developer platform that turns plain scripts into production workflows, internal apps, and scheduled jobs. Write functions in Python, TypeScript, Go, Bash, or SQL; Windmill auto-generates a UI for their parameters, lets you chain them into flows with branching, loops, retries, and approval steps, and runs everything on a self-hostable engine with audit logs and permissions. A drag-and-drop app builder turns the same scripts into internal tools. Compared to node-based tools like n8n, Windmill is code-first: instead of configuring integration nodes, you write real code and get versioning, review, and testing along with it.

Key Features

Scripts in Python, TypeScript, Go, Bash, and SQL become runnable jobs

Flow builder with branching, loops, retries, and approval steps

Auto-generated UIs from script parameters plus a low-code app builder

Schedules, webhooks, and event triggers

Self-hostable open source core with enterprise SSO and audit logs

Use Cases

Replace cron servers with versioned, observable scheduled jobs
Build internal admin tools on top of existing scripts
Automate data pipelines with retries and error handling
Add human-approval steps to sensitive operations

How to Use Windmill

1Self-host with Docker Compose or sign up for Windmill Cloud
2Write a script in the web IDE or sync from Git
3Compose scripts into a flow and add triggers or schedules
4Share the auto-generated UI or build an app on top

Best For

Engineering teams who prefer code over node canvasesSelf-hostersData and platform engineers

FAQ

Is Windmill really open source?

Yes — the core engine is open source (AGPLv3) and can be self-hosted free with unlimited executions. Paid cloud and enterprise editions add SSO, audit logs, and dedicated support.

How does Windmill compare to n8n?

n8n is node-based with hundreds of prebuilt integrations; Windmill is code-first, turning scripts you write into flows and UIs. Teams comfortable writing Python or TypeScript often find Windmill more maintainable.