This is simply a sandbox, that can be used as a starting point for building platform agnostic app based with react and react-native. It's created with an idea to share business logic between web-app and native-app, but not to bring difficulties aligning UI for such a different platforms.
Runs your web app in development mode with an interactive prompt.
Like npm start, but also attempts to open your app in the iOS Simulator if you're on a Mac and have it installed.
Like npm start, but also attempts to open your app on a connected Android device or emulator. Requires an installation of Android build tools (see React Native docs for detailed setup).
Like npm start, but prerender your web apps before serving it.