ChatAPI – PWA to Use ChatGPT by API
I've built this PWA to use ChatGPT by API. My main motivation was to use the API since it is much cheaper than the premium plan and I only pay for usage. The main inspiration was ChatGPT-web by Niek [1], but I was lacking time to dig into the code base to make changes. Hence I went for a lightweight approach with Alpine.js and Open Props. There is no build step, the dependencies are fetched via CDN. In general it was much fun to work with Alpine.js - being a parent means having very little time. So it was great to not have to invest 20h into learning a new framework. My main ask was…
In plain words
ChatAPI is a progressive web app that lets developers use OpenAI's ChatGPT API directly through a browser interface. Built with Alpine.js and Open Props, it requires no build step and loads dependencies via CDN. It's designed for developers who want to avoid ChatGPT's premium subscription costs and instead pay only for API usage. The app includes dynamic syntax highlighting for code snippets and can be self-hosted from the provided source code.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I've built this PWA to use ChatGPT by API. My main motivation was to use the API since it is much cheaper than the premium plan and I only pay for usage. The main inspiration was ChatGPT-web by Niek [1], but I was lacking time to dig into the code base to make changes. Hence I went for a lightweight approach with Alpine.js and Open Props. There is no build step, the dependencies are fetched via CDN. In general it was much fun to work with Alpine.js - being a parent means having very little time. So it was great to not have to invest 20h into learning a new framework. My main ask was something that gives me data binding and does not require a build step. Alpine.js was the perfect fit! A hacky bit I'm proud of is the dynamic loading of languages for syntax highlighting with highlight.js :) Feel free to fork, adapt and host for yourself!
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