expo/exact: A cross-platform application runtime for AI agents and native apps

Exact is a cross-platform application runtime that allows developers to build native apps for the web, macOS, iOS, and Linux from a single declarative Contract definition and TypeScript or Rust data logic. The system uses a Rust runner and layout kernel with native UI presenters while avoiding webviews and JavaScript bridges in the user interface. It is specifically designed to support coding agents that can autonomously generate, run, and test apps across all target hosts using a standard set of operations. Open article →