# Expo's Exact framework lets coding agents build and test one app across four platforms

> Source: <https://runtimewire.com/article/expo-exact-agent-native-cross-platform-framework>
> Published: 2026-11-10 00:05:43+00:00

# Expo's Exact framework lets coding agents build and test one app across four platforms

**On November 9th, Expo updated Exact's README to feature a demonstration store on web, iOS and macOS. The experimental runtime supports four platforms.**

        By [RuntimeWire Staff](https://runtimewire.com/author/runtimewire-staff)
        · Published 

Primary source: [Hacker News](https://github.com/expo/exact)

## Why it matters

Exact is Expo's test of a cross-platform framework designed for coding agents, with constrained languages, visual inspection and portable tests built into the runtime.

Expo co-founder [Charlie Cheever](https://medium.com/harvard-in-tech/harvard-in-tech-spotlight-charlie-cheever-early-facebook-engineer-and-co-founder-of-quora-and-512a3d83548f?ref=runtimewire) is the author named in the patch for the [November 9th README update](https://github.com/expo/exact/commit/94b8671f70fe2e25b307a40e7fce66dc27c9f802?ref=runtimewire) to [Exact](https://github.com/expo/exact?ref=runtimewire), a cross-platform application runtime from Expo.…

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