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TL;DR - Windmill
- Windmill is an open-source developer platform for internal tools
- It runs scripts and workflows with a visual builder
- Free self-hosted option, Cloud available
Pricing: Free plan available
Best for: Growing teams
Score: 82/100
Pros & Cons
Pros
- Open source workflow engine
- Scripts and flows
- Self-hostable
- Good UI
- Active development
Cons
- Learning curve
- Documentation improving
- Smaller community
- Enterprise features limited
- Setup complexity
Key Features
Scripts platformFlowsAppsSelf-hostedMulti-languageOpen source
Pricing
Freemium
Windmill offers a generous free tier with optional paid upgrades for advanced features.
About Windmill
By Toolradar Team·
Windmill turns scripts into workflows and UIs. Python and TypeScript scripts become apps—rapid internal tool development.
The script-to-app transformation is fast. The workflow building is visual. The platform is open source.
Teams wanting to turn scripts into tools explore Windmill for rapid app building.
Reviews
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Windmill FAQ
Is Windmill free?
Self-hosted is free and open source. Cloud from $10/month per user. AGPLv3 license.
What is Windmill?
Windmill is an open-source developer platform. Scripts, workflows, and UIs from code. Retool alternative.
Windmill vs Retool?
Windmill is open source and code-first. Retool is more visual. Windmill for developers; Retool for non-devs.
What languages does Windmill support?
TypeScript, Python, Go, Bash, SQL, and GraphQL. Multi-language workflows. Run any code.
Source: windmill.dev