React Native vs Flutter: Key Differences and When to Use Each

React Native uses JavaScript and bridges native components, while Flutter uses Dart and renders UI with its own engine. Flutter offers more consistent UI and better performance, but React Native has a larger ecosystem and easier web integration.

Quick Comparison

Here is a quick side-by-side comparison of React Native and Flutter on key factors.

Factor	React Native	Flutter
Programming Language	JavaScript (or TypeScript)	Dart
UI Rendering	Uses native components via bridge	Own rendering engine with widgets
Performance	Good, but bridge can add overhead	Generally faster with direct rendering
Development Experience	Hot Reload, large ecosystem	Hot Reload, growing ecosystem
Platform Support	iOS, Android, Web (via extra libs)	iOS, Android, Web, Desktop
Community & Libraries	Mature, many third-party libs	Growing rapidly, fewer libs

Key Differences

React Native uses JavaScript and relies on a bridge to communicate with native UI components. This means it uses the platform's native widgets, which can lead to a more native look but sometimes causes performance overhead due to the bridge.

Flutter uses Dart and renders everything using its own high-performance engine. This allows Flutter to provide consistent UI across platforms and generally better performance because it avoids the bridge.

React Native has a larger ecosystem with many libraries and easier integration with existing web projects, while Flutter offers a more unified development experience with a rich set of customizable widgets but a smaller, newer ecosystem.

Code Comparison

Here is a simple example showing how to create a button that shows an alert when pressed in React Native.

javascript

import React from 'react';
import { View, Button, Alert } from 'react-native';

export default function App() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Button
        title="Press me"
        onPress={() => Alert.alert('Hello from React Native!')}
      />
    </View>
  );
}

Output

A centered button labeled 'Press me' that shows an alert 'Hello from React Native!' when tapped.

Flutter Equivalent

Here is the same button example implemented in Flutter.

dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: ElevatedButton(
            child: Text('Press me'),
            onPressed: () {
              showDialog(
                context: context,
                builder: (context) => AlertDialog(
                  content: Text('Hello from Flutter!'),
                ),
              );
            },
          ),
        ),
      ),
    );
  }
}

Output

A centered button labeled 'Press me' that shows a dialog with 'Hello from Flutter!' when tapped.

When to Use Which

Choose React Native if you want to leverage your JavaScript skills, need faster web integration, or want to use a mature ecosystem with many third-party libraries. It is great for apps that require native UI components and quick development with existing web code.

Choose Flutter if you want consistent UI across platforms, better performance, and are open to learning Dart. Flutter is ideal for apps that need custom designs and smooth animations, or when targeting multiple platforms including desktop and web with a single codebase.

Key Takeaways

React Native uses JavaScript and native components via a bridge, Flutter uses Dart and its own rendering engine.

Flutter generally offers better performance and consistent UI across platforms.

React Native has a larger ecosystem and easier web integration.

Choose React Native for JavaScript familiarity and mature libraries.

Choose Flutter for custom UI, performance, and multi-platform support.