Show HN: FastApps – zero-boilerplate framework for building ChatGPT apps (fastapps.org)

2 points by zachpark 9mo ago ↗ HN

Building interactive widgets for ChatGPT turned out to be way more complex than I expected. Between the MCP protocol, widget registration, build setup, CSP policies, and resource serving — I kept writing the same boilerplate over and over just to get something basic working.

That’s why I built FastApps, an open-source framework that lets you build ChatGPT apps with only two files: a Python backend and a React frontend.

It removes all the glue code and focuses on developer experience:

- Auto-discovers and registers MCP widgets automatically

- Builds and bundles React UIs with zero config

- Manages CSP, metadata, and resource serving out of the box

- Type-safe data flow with Pydantic and React hooks

- Runs as an MCP server, fully compatible with ChatGPT and other MCP clients

If you’ve been experimenting with MCP or building ChatGPT tools, I’d love your feedback. It’s fully open source — and I’m looking for contributors who want to help shape this ecosystem together.

GitHub → https://github.com/DooiLabs/FastApps

Docs → https://www.fastapps.org/

5 comments

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rosaaie 9mo ago ↗

looks promising. So is this basically just a codegen tool or scaffolding to save some boilerplate or is it an actual runtime framework that keeps running alongside the chatgpt?

[deleted] 9mo ago ↗

(comment deleted)

donebydone 9mo ago ↗

Oh nice. I actually thought about building something similar. Did you benchmadk the one Vercel made for nextjs?

dohyun1m 8mo ago ↗

Hi I'm David, Co-founder of FastApps! Yes we did benchmark Next.js support for ChatGPT apps. We figured out there was nothing like it for python.

Apps in ChatGPT is based on MCP servers, and as you know many people develop mcp servers in python. So we believe that FastApps would be the best choice for people who are building ChatGPT apps in python.

[deleted] 8mo ago ↗