Chapplin – a type-safe, all-in-one framework for the ChatGPT Apps SDK

Show HN: Chapplin – a type-safe, all-in-one framework for the ChatGPT Apps SDK

Chapplin – a type-safe, all-in-one framework for the ChatGPT Apps SDK operates in show hn launch.

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I 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.

Within the show hn launch space, the company focuses on its core offering rather than a broad product line.

Its current recorded stage is Show HN launch.

Website: chapplin.vercel.app