React Native enables the communication between JavaScript and the native language via the JavaScript bridge. Here’s how it works: the two sides communicate by sending JSON messages. The messaging is asynchronous, which means the app’s UI should be smooth. Still, there’s a chance of a lagging UI in the end because the bridge impacts the rendering speed.

In contrast, Flutter doesn’t require a bridge to communicate with native components. It has everything packed within itself, including frameworks like Cupertino and Material Design. Thanks to this Flutter advantage, apps are more stable and predictable on different platforms than React Native apps.