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[ARTICLE · art-166695] src=runtimewire.com ↗ pub= topic=ai-agents verified=true sentiment=· neutral

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

Expo updated the README for its experimental Exact cross-platform runtime on November 9th to feature a demonstration store running on web, iOS and macOS, with the runtime supporting four platforms. Expo co-founder Charlie Cheever is named as the author in the commit for the README update. Exact is built for coding agents, with constrained languages, visual inspection and portable tests built into the runtime.

read1 min views1 publishedNov 10, 2026
Expo's Exact framework lets coding agents build and test one app across four platforms
Image: Runtimewire (auto-discovered)

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 is the author named in the patch for the November 9th README update to Exact, a cross-platform application runtime from Expo.…

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