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

Use Flutter when you want fast, consistent UI across platforms with a single codebase and high performance. Choose React Native if you prefer JavaScript, need easier integration with native code, or want to leverage a large existing ecosystem.

Quick Comparison

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

Factor	Flutter	React Native
Programming Language	Dart	JavaScript / TypeScript
UI Rendering	Own rendering engine (Skia)	Uses native UI components
Performance	Near-native, high performance	Good, but depends on bridge communication
Development Experience	Hot reload, strong tooling	Fast refresh, large JS ecosystem
Ecosystem & Libraries	Growing, but smaller	Mature, large community
Platform Support	iOS, Android, Web, Desktop	iOS, Android, Web (via extra libs)

Key Differences

Flutter uses the Dart language and draws every pixel on the screen using its own rendering engine called Skia. This means the UI looks consistent across platforms and you have full control over design and animations. Flutter apps often perform better because they don’t rely on native UI components or a JavaScript bridge.

React Native uses JavaScript and renders native UI components by communicating through a bridge. This allows apps to feel more native but can cause performance overhead in complex animations or heavy UI updates. React Native benefits from a huge JavaScript ecosystem and easier integration with existing native code.

Flutter’s approach means you get a uniform look and feel and faster performance, while React Native offers more native platform integration and flexibility if you already know JavaScript.

Code Comparison

Here is a simple example showing how to create a button that shows a message when pressed 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(
        appBar: AppBar(title: Text('Flutter Button')),
        body: Center(
          child: ElevatedButton(
            onPressed: () {
              print('Button pressed');
            },
            child: Text('Press me'),
          ),
        ),
      ),
    );
  }
}

Output

A screen with an app bar titled 'Flutter Button' and a centered button labeled 'Press me'. Pressing the button prints 'Button pressed' to the console.

React Native Equivalent

Here is the same button example implemented in React Native using JavaScript.

javascript

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

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

Output

A screen with a centered button labeled 'Press me'. Pressing the button shows an alert popup with 'Button pressed'.

When to Use Which

Choose Flutter when you want a highly performant app with consistent UI across platforms and prefer using Dart. It’s great for apps with custom designs and animations.

Choose React Native if you or your team are experienced in JavaScript, want faster integration with native modules, or rely on a large ecosystem of JavaScript libraries. It’s ideal when you want to share code with web projects or use existing native code.

Key Takeaways

Flutter offers better performance and consistent UI with its own rendering engine.

React Native uses JavaScript and native components, benefiting from a large ecosystem.

Use Flutter for custom designs and animations with a single codebase.

Use React Native if you prefer JavaScript and need easier native integration.

Both support iOS and Android, but Flutter also targets web and desktop more fully.