Windmill

Name: Windmill
Brand: Windmill.dev
Rating: 4.9 (12 reviews)

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Open-source developer platform for scripts

Developer Tools App Builders Internal Tools

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4.9(12 across the web)

FreemiumVisit Website

Reviews onG2Capterra

12 reviews tracked

The Bottom Line

Entry price

Free plan available, paid tiers above

Biggest pro

Open source workflow engine

Biggest con

Learning curve

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

4.9/5 across review platforms

What is Windmill?

Editorial review

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.

Available on: Web

LCLouis CorneloupUpdated May 26, 2026 · how we evaluateSourcewindmill.dev ↗

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

Ratings Across the Web

4.9(12 reviews)

Ratings aggregated from independent review platforms. Learn more

Key Features

Scripts platformFlowsAppsSelf-hostedMulti-languageOpen source

Pricing

Freemium

Windmill offers a generous free tier with optional paid upgrades for advanced features.

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Reviews

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4.9/5

Across 12 verified user reviews on G2, Capterra

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Best Windmill Alternatives

Top alternatives based on features, pricing, and user needs.

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TooljetFreemium

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Internal.ioFreemium

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Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

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Windmill FAQ

How does Windmill facilitate internal tool development?

Windmill allows developers to transform Python and TypeScript scripts into workflows and user interfaces, enabling rapid internal tool development. This script-to-app transformation helps teams quickly build and deploy custom applications.

Which teams would benefit most from using Windmill?

Teams that frequently use scripts and need to turn them into functional tools will find Windmill particularly useful. It is designed for developers looking for a platform to build rapid applications and internal utilities.

How does Windmill compare to Retool for building internal tools?

Windmill is an open-source developer platform that turns scripts into workflows and UIs, offering self-hostability and an open-source workflow engine. Retool is also an internal tool builder, but Windmill provides the flexibility of an open-source solution with active development.

What kind of limitations should users be aware of with Windmill?

Users should be prepared for a learning curve and acknowledge that the documentation is still improving. Additionally, Windmill currently has a smaller community and its enterprise features are limited compared to more established platforms, and setup can be complex.

Does Windmill include a free tier for users?

Yes, Windmill is available on a free tier, allowing users to get started without initial cost. Paid plans are also offered for those requiring more extensive usage and additional features.

Can Windmill be self-hosted by organizations?

Yes, Windmill offers self-hostability, which is a key strength of the platform. This allows organizations to deploy and manage the developer platform within their own infrastructure.

Source: windmill.dev

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