Tried OpenAI Apps SDK Development but quickly ran into roadblocks:
You need a paid account just to debug, and local testing means dealing with ngrok and CSP issues. Not ideal.
So I built OAI App Composer - A local dev tool that mocks the "window.openai API" so you can build, preview, and export ChatGPT App components without any MCP server, tunnels, or auth.
It supports React with hot reload, mock data editor, and full ChatGPT-like preview. Local-first, friction-free, and perfect for UI devs exploring the new Apps SDK.
Would love for others to try it out, break it, and contribute ideas or improvements.
Tried OpenAI Apps SDK Development but quickly ran into roadblocks:
You need a paid account just to debug, and local testing means dealing with ngrok and CSP issues. Not ideal.
So I built OAI App Composer - A local dev tool that mocks the "window.openai API" so you can build, preview, and export ChatGPT App components without any MCP server, tunnels, or auth. It supports React with hot reload, mock data editor, and full ChatGPT-like preview. Local-first, friction-free, and perfect for UI devs exploring the new Apps SDK.
Would love for others to try it out, break it, and contribute ideas or improvements.