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Windmill

Windmill is a free, open-source alternative to Retool, internal tools. Appex Technology deploys and customizes it on your own cloud account — you own the code, the data, and the infrastructure, with no per-seat fees and no vendor lock-in.

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Free to license
Open-source core — you pay for infrastructure, not seats.
Self-hosted on your cloud
Your Windmill instance runs on your AWS or other cloud account.
No lock-in
Documented code in your repos. Move providers or take it in-house any time.
About Windmill

What it is and what it replaces

Turn scripts into internal tools, workflows, and UIs — a developer-first automation platform.

Unlike Retool, internal tools, Windmill is open-source and completely free to license. There are no per-user fees that grow with your headcount, no subscription renewals, and no data stored on a vendor's servers. You get the same core capabilities — and, with Appex Technology's customization, a version tailored exactly to your workflows.

Windmill official site ↗
What Appex Technology delivers

From deployment to a running system

  • Cloud deploymentWe deploy Windmill on your AWS, Google Cloud, or other provider — with backups, monitoring, and security hardened from day one.
  • Custom configurationCustom fields, workflows, permissions, and integrations shaped around the way your team actually works.
  • Data migrationWe migrate your existing data from Retool or another source so you start with a live system, not an empty one.
  • IntegrationsWe wire Windmill into your other tools — CRMs, payment systems, ERPs, or anything with an API.
  • Documentation & handoverFull runbook and admin docs so your team can operate it independently. No dependency on us to keep the lights on.

Windmill vs Retool, internal tools

Both solve the same core problem. The difference is who owns the data and who writes the monthly check.

Windmill (self-hosted)Retool (SaaS)
License costFreeSubscription / per-seat
Data locationYour cloud accountVendor's servers
CustomizationFull — code-level controlLimited to their settings
Lock-inNoneSwitching costs can be high
Ongoing feesInfrastructure onlyGrows with headcount
SetupAppex Technology handles itSign up + configure
FAQ

Windmill — common questions

What is Windmill?+
Windmill is an open-source, self-hostable platform that can replace Retool, internal tools. Turn scripts into internal tools, workflows, and UIs — a developer-first automation platform.
How does Windmill compare to Retool?+
Windmill is free to license and runs on your own cloud account. Unlike Retool, there are no per-seat fees, no vendor lock-in, and your data never leaves infrastructure you control. Appex Technology customizes, deploys, and maintains it for you.
Can Appex Technology deploy Windmill on our cloud?+
Yes. We deploy Windmill on your AWS, Google Cloud, or other cloud account, configure it to your workflows, integrate it with your other tools, and hand over complete documentation. You own the infrastructure and the deployment outright.
How long does it take to get Windmill running?+
A standard deployment and configuration typically takes a few weeks, depending on the level of customization. We start with a scoping call to understand your requirements, then send a clear estimate before any work begins.
Do we need to manage the server ourselves?+
Only if you want to. We can set up automated backups, monitoring, and update policies so your Windmill instance stays healthy with minimal hands-on effort. We also offer ongoing maintenance retainers.

Ready to replace Retool?

Tell us about your team and current setup — we'll scope a Windmill deployment that fits.

Start a projectinfo@appextechnology.com