Expo Docs

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The best way to interactively test and verify the behavior and feel of your app as you change code is by loading it in the Expo Client App, as described in other guides.
There are several ways to get the client app into a test environment.

This is the simplest and easiest way, and the one we recommend for all developers.

The client apps are open-source, and their readme contains instructions on how to compile them locally and install them onto devices attached to your computer by a USB cable.

The client apps github repository also includes instruction on how to build and run the iOS Client App in the Xcode Device Simulator, and the Android Client App in the Android Studio Device Emulator.