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Windmill
AI Code & DevFreemium

Windmill

Open-source developer platform that turns scripts into workflows, APIs, and internal tools with AI-assisted automation.

4.5rating
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Open SourceWorkflow AutomationInternal Tools

About Windmill

Windmill is an open-source developer platform that promises to transform your scripts into workflows, APIs, and internal tools with a sprinkle of AI-assisted automation. What really caught my attention during testing was how it allows developers to whip up production-grade solutions without the usual fuss associated with traditional tools. The claim of being 13 times faster than stalwarts like Airflow? Bold, but I found there was some merit to it—especially when it came to how quickly I could get my scripts up and running.

When I dove into Windmill, I was struck by the support for a plethora of programming languages, including TypeScript, Python, Go, PHP, Bash, SQL, and even Docker. This makes it incredibly flexible for teams already entrenched in specific tech stacks. The interface is clean, and the workflow generation feels intuitive, yet I did find myself wishing for a bit more guidance on some of the more advanced features. Windmill’s debugging tools are a highlight, helping to pinpoint issues in real-time, which saved me a fair bit of headache during my testing.

As for pricing, Windmill has a freemium model that’s particularly appealing for startups or small businesses. The self-hosted edition is free with unlimited executions—yes, you read that right! This is a fantastic option for those who want to keep costs down while still benefiting from automation. However, for teams looking for a cloud solution, the free tier limits you to 1,000 executions per month, which might feel a bit restrictive if you’re scaling up. The paid plan starts at $10 per developer per month, which is reasonable but can add up quickly depending on your team size.

In my experience, Windmill is best suited for developers and technical teams who need a self-hosted solution that they can fully control. The open-source aspect means you can customise it to your heart’s content, but if you’re not comfortable with self-hosting or tweaking code, you might find it a bit daunting. Additionally, larger teams with complex needs might want to proceed with caution; while it does offer a lot, you might encounter some pitfalls if you’re not well-versed in the setup. Overall, Windmill does a fantastic job of bridging the gap between simplicity and power, making it a tool worth considering for the right audience.

Our Review

Verified 11 May 2026

Reviewed by Delv Editorial, Delv Team

I recently took Windmill for a spin, and I have to say, I was pleasantly surprised by how it simplifies the workflow automation process. As someone who's dabbled in coding but isn't a full-blown developer, I was cautious about how intuitive this platform would be. Spoiler alert: it’s pretty user-friendly! The moment I logged in, I was greeted with a clean interface that didn’t bombard me with jargon. I began by uploading a simple Python script, and before I knew it, I had a functioning workflow ready to go. The AI-assisted automation was a cherry on top, as it made some suggestions that genuinely streamlined the process.

What really sets Windmill apart, in my opinion, is the free self-hosted version. Unlimited executions? Yes, please! For small businesses or startups, this is a lifesaver. I can’t count how many times I’ve seen teams sink money into tools that don’t deliver. With Windmill, you get a powerful solution without the financial strain. However, I did hit a snag when I tried to scale my workflow. The free cloud tier only allows for 1,000 executions a month, which might not cut it for a growing team. Plus, if you’re not comfortable with self-hosting, the learning curve could be a bit steep.

I also found the debugging tools to be particularly useful. There’s nothing worse than wrestling with code and not knowing where it’s going wrong. Windmill’s debugging features made it easy to spot errors, which saved me a lot of time. That said, the documentation could use a bit more depth, especially for the advanced features. I often found myself wishing for a more detailed guide when I tried to explore beyond the basics.

In terms of competition, Windmill holds its ground against tools like Airflow, but it’s less intimidating for those who aren’t hardcore developers. Airflow has its merits, but it can feel cumbersome, especially when you’re just starting. Windmill, though, is approachable without sacrificing power.

In conclusion, if you’re a small to medium-sized tech startup, or perhaps a freelance developer looking to automate some of your workflows without breaking the bank, Windmill might be your new best friend. Just be prepared to get your hands a little dirty with self-hosting if you choose that route. For those who prefer a more hands-off experience, though, I’d recommend exploring other options. But for the right audience, Windmill is a solid tool that genuinely delivers on its promises.

Getting started with Windmill

In this guide, you'll learn how to quickly set up Windmill and create your first automated workflow. By the end, you’ll be able to transform your scripts into functional applications and tools with ease.

Step 1: Sign up and set up

  • Go to [Windmill's website](https://www.windmill.dev).
  • Click on the **Get Started** button at the top right.
  • Choose the **Cloud** option if you want to use the free tier, or select **Self-hosted** for the open-source version.
  • For the Cloud version, fill in your details to create an account, and verify your email.
  • Log in to your new Windmill account.
  • Step 2: Your first workflow

  • Once logged in, click on the **New Workflow** button on your dashboard.
  • In the workflow editor, start by adding a script. Click on **Add Step** and select **Script**.
  • Write your script in the provided code editor. For example, create a simple function that fetches data from an API.
  • Next, click on **Add Step** again and choose **API** to create an endpoint for your workflow.
  • Configure the API settings by specifying the method (GET, POST, etc.) and linking it to the script you just created.
  • Click **Save** to save your workflow, then click **Run** to execute it.
  • Step 3: Get better results

  • Use **Variables** to store data between steps. Click on **Add Variable** to define reusable data points.
  • Explore the **AI Suggestions** feature by clicking on the **AI** button in the editor. This can help optimise your scripts.
  • Set up **Triggers** to automate your workflows. Go to the **Triggers** tab and select the events that will start your workflow automatically.
  • Pro tip

    Use the Import feature to bring in existing scripts from your local machine. This can save time instead of rewriting them from scratch.

    Common mistake to avoid

    Avoid skipping the Testing phase. Always run your workflow after making changes to ensure everything functions correctly. This can prevent issues later when you deploy your tool.

    The Verdict

    Windmill is a fantastic choice for tech-savvy developers and startups wanting to automate workflows without hefty costs. Its self-hosted version offers unlimited executions, making it a strong contender in the space. However, if you’re not comfortable with self-hosting or need a more user-friendly cloud solution, you might want to look elsewhere.

    Best For

    • Small to medium-sized tech startups looking for cost-effective automation solutions.
    • Developers familiar with coding who want to turn scripts into workflows quickly.
    • Teams needing a self-hosted solution to maintain control over their data.
    • Freelancers wanting an affordable way to manage multiple client workflows.
    • Technical teams interested in experimenting with AI-assisted automation.

    At a Glance

    Windmill is an open-source platform that converts scripts into workflows and internal tools with AI-assisted automation, designed for developers who want fast, cost-effective solutions. Its support for various programming languages and unlimited executions in the self-hosted edition make it a compelling choice for tech-savvy teams. However, those unfamiliar with self-hosting might find it challenging.

    Strengths

    • +The self-hosted version is free and includes unlimited executions, which is a dream for startups looking to automate without breaking the bank.
    • +Windmill supports a variety of programming languages, making it easy for developers to integrate it into their existing workflows without a steep learning curve.
    • +The platform's AI-assisted automation features help streamline the process of creating workflows, allowing for quicker deployment and iteration.
    • +Debugging in Windmill is straightforward and effective, enabling developers to identify and fix issues in real-time, which can save a lot of time.
    • +The user interface is clean and intuitive, making it relatively easy to navigate, even for those new to workflow automation tools.

    Limitations

    • -The free cloud tier limits users to 1,000 executions per month, which could be restrictive for teams that are scaling up quickly.
    • -While the platform is powerful, some advanced features could use better documentation to help users fully leverage its capabilities.
    • -The reliance on self-hosting may deter non-technical users or those without a strong IT background, leaving them to miss out on the benefits.
    • -Although Windmill claims to be faster than traditional tools, the actual speed can vary based on your specific use case and setup.

    Use Cases

    • -Small to medium-sized tech startups that want to automate internal processes without incurring heavy costs.
    • -Development teams that need a reliable platform to convert scripts into production workflows quickly and efficiently.
    • -Companies looking for a self-hosted solution to maintain control over their data and workflow processes.
    • -Tech-savvy teams that want to experiment with AI-assisted automation in their existing projects without a steep learning curve.
    • -Freelance developers looking for a cost-effective way to create and manage workflows for multiple clients.

    Alternatives

    Airflow - a more traditional option that offers powerful scheduling and monitoring but can be more complex to set up.
    Zapier - ideal for non-technical users who want to automate tasks between apps without needing to write code.
    n8n - another open-source alternative that offers similar capabilities but might be more user-friendly for those looking for a visual interface.
    Camunda - great for teams needing BPM capabilities and more complex workflow management.

    Frequently Asked Questions

    Windmill is an open-source platform that converts scripts into workflows and internal tools with AI-assisted automation, designed for developers who want fast, cost-effective solutions. Its support for various programming languages and unlimited executions in the self-hosted edition make it a compelling choice for tech-savvy teams. However, those unfamiliar with self-hosting might find it challenging.
    The key advantages of Windmill include: The self-hosted version is free and includes unlimited executions, which is a dream for startups looking to automate without breaking the bank.. Windmill supports a variety of programming languages, making it easy for developers to integrate it into their existing workflows without a steep learning curve.. The platform's AI-assisted automation features help streamline the process of creating workflows, allowing for quicker deployment and iteration.. Debugging in Windmill is straightforward and effective, enabling developers to identify and fix issues in real-time, which can save a lot of time.. The user interface is clean and intuitive, making it relatively easy to navigate, even for those new to workflow automation tools..
    Some limitations of Windmill include: The free cloud tier limits users to 1,000 executions per month, which could be restrictive for teams that are scaling up quickly.. While the platform is powerful, some advanced features could use better documentation to help users fully leverage its capabilities.. The reliance on self-hosting may deter non-technical users or those without a strong IT background, leaving them to miss out on the benefits.. Although Windmill claims to be faster than traditional tools, the actual speed can vary based on your specific use case and setup..

    Pricing & Availability

    Freemium

    Self-hosted open-source: free with unlimited executions. Cloud: free tier with 1,000 executions/mo. Team from $10/developer/mo.

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