Windmill
Open-source developer platform that turns scripts into workflows, webhooks and internal UIs.
- Verified facts
- 4 of 4
- Alternatives ranked
- 4
- Approved reviews
- 0
- Visits sent from here
- 0
About Windmill
Windmill is an open-source platform for engineers that combines three things often bought separately: a script runner, a workflow engine and an internal app builder. You write scripts in Python, TypeScript, Go, PHP, Bash or SQL, and Windmill turns them into endpoints, scheduled jobs and auto-generated forms, chains them into workflows with retries, approvals and branching, and lets you build UIs on top with a drag-and-drop app editor or full React code. It positions itself as an alternative to Retool for the interface side and to Airflow or Temporal for orchestration, with a fast job engine. The Community Edition is free to self-host with Docker or Kubernetes and has unlimited executions; paid cloud and enterprise self-hosted plans are priced per builder, and up to 100 guest users a month are free. It runs in the browser. Its app builder is less polished than Retool's, and the platform assumes users are comfortable writing code.
Best for: Engineering teams that want scripts, workflows and internal UIs in one self-hosted platform.
Pros and cons
What works
- Scripts, workflows and apps in one place
- Supports many languages including Python and TypeScript
- Free self-hosted edition with unlimited executions
Why people leave
- Built for developers, not business users
- App builder is less polished than Retool's
- Enterprise features need a paid licence
Top Windmill alternatives
See all 4- 1
Retool66.5More polished UI builder, with Retool Workflows for scheduled jobs.
- 2
Appsmith57.2Open-source app builder if UIs matter more than orchestration.
- 3
ToolJet55.3Open-source builder that pairs apps with built-in workflows.
- 4
n8n52.2Visual workflow automation with many integrations, also self-hostable.
Why people left Windmill
In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.
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Reviews
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Windmill: common questions
Is Windmill free?
Yes. Windmill is free, open-source software that you can host yourself.
Is Windmill open source?
Yes. The source code is on GitHub at windmill-labs/windmill. You can also run it on your own server.
What platforms does Windmill run on?
Windmill is available for Web and Self-hosted.
What are the best alternatives to Windmill?
The highest-ranked Windmill alternatives right now are Retool, Appsmith and ToolJet. See the full ranked list for pricing, platforms and verified facts.