Skybridge

Skybridge, an open-source (MIT-licensed) framework from Paris-based Alpic — contributors to the official Model Context Protocol specification — is a full-stack React framework for building MCP applications that run consistently across Claude, ChatGPT, VS Code, Cursor, and other MCP clients. It gives developers a familiar React workflow (react-query-style hooks, tRPC-style type inference from server tools to components) plus a local emulator, hot module reload, and public tunneling for development, and includes a built-in server-audit feature to test compliance against Claude and ChatGPT's own platform guidelines before shipping. With 100K+ monthly npm downloads and 1K+ GitHub stars, plus a feature in OpenAI's own developer documentation, it has real, checkable adoption. Being free and open source, there's no pricing to evaluate — the tradeoff is the usual one for any framework: you're building against Skybridge's specific abstractions rather than raw MCP SDK calls. Good fit for a React developer building an MCP application who wants a batteries-included framework and cross-client compatibility testing built in, rather than assembling MCP tooling from scratch.