React Native vs Flutter

React Native and Flutter are the two leading cross-platform mobile frameworks. React Native uses JavaScript and native platform components. Flutter uses Dart and a custom rendering engine to draw every pixel directly.

Rendering Architecture

React Native renders actual native UI components (UIKit on iOS, Android Views on Android). This means your app automatically matches platform conventions — buttons, switches, and navigation feel native because they are native.

Flutter draws every pixel using its own Skia-based rendering engine. The UI looks identical on iOS and Android (unless you explicitly differentiate). This gives you complete control over every visual detail but means Flutter UIs do not automatically match platform conventions.

The New Architecture

React Native's New Architecture (JSI, Fabric, TurboModules) eliminates the old bridge bottleneck. JavaScript communicates synchronously with native code, enabling smoother animations and faster data transfer. This significantly closes the performance gap with Flutter.

Code Sharing Strategy

React Native's biggest strategic advantage is TypeScript. You can share validation logic, API types, and business logic between your React Native mobile app, Next.js web app, and Node.js backend. This is a powerful argument for organizations building for multiple platforms.

Flutter's Dart ecosystem is more isolated. Code sharing is limited to other Flutter targets (web, desktop, mobile).

System Design Considerations

For system design interviews, the mobile framework choice affects the client architecture but not the backend. Focus on API design, caching strategies, push notifications, and offline support.

Explore more in our comparison guides and interview preparation.