How to inspect DOM tree of React Native app?

The closest you're going to get is the inspector from the in-app developer menu (click show inspector).

To access the in-app developer menu:

On iOS shake the device or press control + ⌘ + z in the simulator.

On Android shake the device or press hardware menu button (available on older devices and in most of the emulators, e.g. in genymotion you can press ⌘ + m to simulate hardware menu button click)

For something closer to Chrome DevTool's Element panel, try using react-native-debugger.

Works on: windows, osx and linux. It supports: react native and redux.