In this guide, you will learn how to turn one public API into a small hosted web app with ChatGPT Sites. You will create a product plan, build an MVP, and deploy it as a site people can actually use.
published jul 18, 2026
Deploy a Mini-SaaS in 10 Minutes With ChatGPT Sites
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The Rundown
Who This Is Useful For
- Anyone who wants a practical first app idea instead of starting with a blank canvas.
- Operators who want to turn a repetitive lookup or decision into a simple tool.
- Non-developers who want to build and share a small web app without designing a full product first.
What You Will Build
You will build a mini-SaaS with one clear job. Our example is WeatherLedger: a tool that uses weather data to show contractors the best hours to work at a jobsite.
What You Need To Get Started
- Access to ChatGPT and Codex, plus a workspace where ChatGPT Sites is available (https://help.openai.com/en/articles/20001339-creating-and-managing-chatgpt-sites). Sites availability can vary by plan, region, and workspace settings.
- An API from the Public APIs list (https://github.com/public-apis/public-apis), plus the API provider's own documentation.
- One small use case. Version one should answer a single question or complete a single task.
Going Further
In the Sites menu, you can see and track web analytics for your deployed apps all in one place. This is also where you can add custom domain names.
Once the first version is working, expand intentionally. Add only the next feature that helps the same user get the same outcome faster or more reliably. A small app that does one job well is a much stronger starting point than a large product plan.