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Home/Categories/Developer Tools/Windmill
icon of Windmill

Windmill

Open source alternative to Retool, Workato and Make

  • 18.2K stars
  • AGPL-3.0
  • Active this week
  • Last commit 2 days ago

Last verified Oct 20, 2026

Run scripts, workflows, jobs, and internal tools from one open source developer platform for Python, TypeScript, Go, Bash, and SQL.

Visit websiteGitHub18.2K stars1-click deploy on Hostinger
image of Windmill
TL;DR

Windmill is a developer automation tool that turns scripts into workflows, webhooks, scheduled jobs, and internal apps. It replaces pieces of Retool, Airflow, Temporal, Make, and Workato for teams that prefer code-first automation in Python, TypeScript, Go, Bash, SQL, and other languages. Source builds without enterprise flags are AGPLv3; packaged Community Edition binaries include additional proprietary terms.

Read the full breakdownHide the full breakdownWho it is for, how it works, trade-offs and the FAQ
who it's for

Who Windmill is for#

Platform engineers replacing script sprawl

Windmill gives platform teams a controlled place to run scripts, schedule jobs, and expose safe internal UIs. Secrets, permissions, and logs stay attached to the workflow instead of scattered across laptops and cron hosts.

Skip if:

Skip it if your team only needs a few local scripts and does not need shared execution, auditability, or reusable internal tools.

Developers building internal operations apps

Developers can write code for the hard parts and let Windmill expose forms, buttons, and workflows around it. This fits admin panels, data repair tasks, and operational approvals.

Skip if:

Use Retool or Appsmith if your priority is a polished visual app builder for mostly database-backed CRUD screens.

the problem

The problem it solves#

Internal automation often splits across too many tools: one product for dashboards, another for cron jobs, another for workflow orchestration, and a pile of scripts nobody owns. That fragmentation slows down incident fixes, data jobs, admin panels, and operations workflows.\u000A\u000ANo-code automation tools are fast at the start but become restrictive when developers need real code, version control, branching logic, or infrastructure-level secrets. Traditional orchestrators solve durable workflows but can feel too heavy for simple scripts and internal tools.

how Windmill solves it

How it solves it#

Script-to-app generation

Windmill can generate user interfaces from script parameters, turning Python, TypeScript, Go, Bash, SQL, and other scripts into runnable internal tools. This reduces the gap between one-off code and repeatable operations workflows.

Workflow orchestration canvas

Chain scripts into workflows with branching, retries, approvals, and scheduled execution. Teams can model operational jobs without moving the logic out of code.

Git-aware workspace model

Windmill supports workspace sync and code-centered workflows, which helps teams review and deploy automation changes through familiar development processes instead of dashboard-only edits.

Webhook and cron execution

Scripts can run on schedules or trigger from HTTP events. That lets one system cover recurring jobs, integration hooks, admin tasks, and on-demand operational tools.

strengths · trade-offs

Strengths and trade-offs#

Strengths

  • Code-first alternative to visual-only buildersWindmill keeps automation logic in real code while still giving non-authors a UI to run it. That is a strong fit for developer teams that outgrow purely visual tools such as Make or Retool workflows.
  • Combines scripts, workflows, and appsA single Windmill workspace can handle scheduled scripts, approval workflows, webhook handlers, and simple internal applications. That reduces the number of small operational systems teams need to maintain.

Trade-offs

  • -Not a pure no-code toolWindmill is best when developers are willing to write and maintain scripts. Business teams looking for a visual-only Zapier-style builder may find the code-first model less approachable.
  • -License and binary terms need reviewWindmill source builds without enterprise flags are AGPLv3, while client and OpenAPI files are Apache-2.0. Community Edition binaries include proprietary code and restrict resale, managed service use, modification, and wrapping without agreement.
versus alternatives

Windmill vs alternatives#

Windmill vs Retool

Windmill and Retool both help teams ship internal tools, but Windmill starts from code and workflows while Retool starts from a visual app builder.

CriterionWindmillRetool
Primary modelScripts, workflows, and appsVisual internal app builder
LanguagesPython, TypeScript, Go, Bash, SQL, and moreJavaScript in a visual builder
Workflow orchestrationBuilt inMore limited for DAG-style automation
LicenseAGPLv3 source build, Apache-2.0 clients, proprietary CE binary termsProprietary SaaS
Best fitDeveloper-owned automationBusiness-facing admin panels

Windmill is the stronger choice when scripts, scheduled jobs, and workflow orchestration are the core problem. Retool is still a better fit when teams need a polished visual builder, many prebuilt UI patterns, and less code ownership.

tech stack · detected from GitHub

What it's built on#

Languages
JavaScriptPythonRustTypeScript
Frameworks
ReactSvelte
Databases
PostgreSQL
Tooling
esbuild
frequently asked

FAQ#

What does Windmill do?

Windmill runs scripts as internal tools, workflows, scheduled jobs, and webhooks. It is designed for developer teams that want automation logic in code with a usable web UI around it.

Is Windmill a Retool alternative?

Windmill can replace Retool for code-driven internal tools and workflow-heavy operations apps. Retool is usually stronger for visual CRUD app building, while Windmill is stronger when scripts and orchestration are central.

Can Windmill replace Airflow?

Windmill can replace Airflow for many operational workflows and scheduled scripts. Data teams with complex data asset lineage, warehouse-native orchestration, or established Airflow DAGs should compare it carefully with Dagster and Airflow before migrating.

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Hostinger

Run Windmill on your own server

Hostinger sets Windmill up as a one-click app on a VPS.

Deploy on Hostinger

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