List Your Product Join or Log In

Windmill

Unclaimed Editor reviewed

Open-source developer platform for scripts

Developer Tools App Builders Internal Tools

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)

Capterra5 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.

Reviews

4.9/5

Across 12 verified user reviews on G2, Capterra

Add your hands-on experience to help the next buyer.

Write a Toolradar review

Best Windmill Alternatives

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

View full list →

Build internal tools, apps, and AI with drag-and-drop

AppsmithFreemium

Open-source platform for building internal tools

BudibaseFreemium

Open-source low-code platform for internal tools

TooljetFreemium

Build internal tools 67% faster with AI low-code

Internal.ioFreemium

Build internal tools and admin panels fast with low-code

AirplaneFreemium

Internal tools and workflows platform

See all Developer Tools tools →

Still deciding?

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

All Windmill alternatives6+ tools ranked, pricing + verdict per pick Windmill vs RetoolHead-to-head: features, pricing, who wins Windmill vs AppsmithHead-to-head: features, pricing, who wins Windmill vs BudibaseHead-to-head: features, pricing, who wins

Explore More

Best Developer Tools Tools Best App Builders Tools Best Internal Tools Tools Best Free Developer Tools Best Free App Builders Best Free Internal Tools

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

Guides & Articles

Best AI Terminal Coding Agents in 2026

Expert guide

Best Code Editors & IDEs in 2026

Expert guide

Best Version Control Tools in 2026

Expert guide