Flutter vs
React Native

import 'package:flutter/material.dart';

class CounterApp extends StatefulWidget {
  @override
  _CounterAppState createState() => _CounterAppState();
}

class _CounterAppState extends State<CounterApp> {
  int _count = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Counter')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              '$_count',
              style: TextStyle(
                fontSize: 48,
                fontWeight: FontWeight.bold,
              ),
            ),
            SizedBox(height: 16),
            ElevatedButton(
              onPressed: () => setState(() => _count++),
              child: Text('Increment'),
            ),
          ],
        ),
      ),
    );
  }
}

import React, { useState } from 'react';
import { View, Text, Button, StyleSheet } from 'react-native';

export default function CounterApp() {
  const [count, setCount] = useState(0);

  return (
    <View style={styles.container}>
      <Text style={styles.count}>{count}</Text>
      <Button
        title="Increment"
        onPress={() => setCount(c => c + 1)}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  count: {
    fontSize: 48,
    fontWeight: 'bold',
    marginBottom: 16,
  },
});