Expo's Exact lets an AI agent build, run, and test one app on web, iOS, macOS, and Linux
Exact – a new cross platform UI framework by the Expo team
Exact is a pre-1.0 cross-platform runtime from the Expo team. You describe the interface in Contract, a small declarative language, and write data logic in TypeScript or Rust. On the web the compiled plan drives the real DOM through a ~20 KB runtime; on Apple and Linux a Rust runner lays out the tree with CSS rules and draws with AppKit, UIKit, or a GPU painter — no webview, no JavaScript bridge. Ten agent operations let an AI build, inspect, and test an app on every host.
Exact assumes much of the code will be written by AI agents. An agent can make an app, run it, look at it, operate it, and prove it works without a person in the loop.