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JavaScript engine optimized for React Native

Check it out in the intro video

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Faster App Launch

Hermes-powered apps launch faster, thanks to build-time precompilation of JavaScript into efficient bytecode.

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Optimized for Mobile

Hermes is small in APK size, lean on memory, and starts instantly. It won't weigh your app down.

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Easy Integration

It's simple to get started with Hermes in React Native apps. Hermes is open source and implements JavaScript standards.