Show HN: Chapplin – a type-safe, all-in-one framework for the ChatGPT Apps SDK
ssssota Wednesday, December 03, 2025I built chapplin, a small framework for making ChatGPT Apps. The Apps SDK gives only low-level primitives, and building UI means bundling a single HTML file with all JS/CSS inside an MCP server. The build setup and type sharing became painful, so I made a tool that hides the build process and provides a type-safe setup end-to-end.
Summary
The article discusses the launch of Chapplin, a new AI-powered virtual assistant that aims to revolutionize the way people interact with technology by providing a more natural and personalized user experience.
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chapplin.vercel.app