I tried Expo's new Exact with Convex

Mike Cann tests Expo’s pre-alpha Exact framework with Convex by building a real-time chat application that runs natively across the web, macOS, and iPhone from a single UI codebase written in Contract, Exact’s typed, Python-like frontend language. The demonstration shows messages, typing indicators, and heart reactions synchronizing through one Convex cloud deployment, while live theme-code changes are rapidly rebuilt and deployed to every device. Although Exact cannot yet run npm packages or provide the standard WebSocket and timer behavior required by Convex’s official client, Cann’s agent created a small custom client that communicates directly with Convex’s sync protocol. He highlights Exact’s potential for agentic development, particularly its controllable clock for more reliable animation testing, while noting that both the framework and the Convex integration remain experimental and that the protocol used is not a documented public API.

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