Here's a Flutter app for downloading YouTube videos. We'll use the `youtube_explode_dart` package to fetch video information and `dio` for downloading. name: youtube_downloader description: A YouTube video downloader app version: 1.0.0+1 environment: sdk: ">=2.17.0 <3.0.0" dependencies: flutter: sdk: flutter youtube_explode_dart: ^1.10.4 dio: ^4.0.6 path_provider: ^2.0.11 permission_handler: ^10.2.0 fluttertoast: ^8.1.2 dev_dependencies: flutter_test: sdk: flutter flutter_lints: ^2.0.0 flutter: uses-material-design: true import 'package:flutter/material.dart'; import 'package:youtube_downloader/screens/download_screen.dart'; void main() { runApp(const MyApp()); } class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'YouTube Downloader', theme: ThemeData( primarySwatch: Colors.blue, ), home: const DownloadScreen(), ); } } import 'dart:io'; import 'package:flutter/material.dart'; import 'package:youtube_explode_dart/youtube_explode_dart.dart'; import 'package:dio/dio.dart'; import 'package:path_provider/path_provider.dart'; import 'package:permission_handler/permission_handler.dart'; import 'package:fluttertoast/fluttertoast.dart'; class DownloadScreen extends StatefulWidget { const DownloadScreen({super.key}); @override State createState() => _DownloadScreenState(); } class _DownloadScreenState extends State { final TextEditingController _urlController = TextEditingController(); bool _isLoading = false; double _downloadProgress = 0.0; String _statusMessage = ''; Future _downloadVideo() async { final url = _urlController.text.trim(); if (url.isEmpty) { _showToast('Please enter a YouTube URL'); return; } setState(() { _isLoading = true; _statusMessage = 'Fetching video info...'; }); try { final yt = YoutubeExplode(); final video = await yt.videos.get(url); setState(() { _statusMessage = 'Getting download link...'; }); final manifest = await yt.videos.streamsClient.getManifest(video.id); final streamInfo = manifest.muxed.withHighestBitrate(); final videoUrl = streamInfo.url.toString(); setState(() { _statusMessage = 'Preparing download...'; }); // Request storage permission final status = await Permission.storage.request(); if (!status.isGranted) { throw Exception('Storage permission denied'); } final dir = await getExternalStorageDirectory(); final savePath = '${dir?.path}/${video.title}.mp4'; setState(() { _statusMessage = 'Downloading...'; }); await Dio().download( videoUrl, savePath, onReceiveProgress: (received, total) { if (total != -1) { setState(() { _downloadProgress = received / total; }); } }, ); _showToast('Download completed!'); } catch (e) { _showToast('Error: ${e.toString()}'); } finally { setState(() { _isLoading = false; _downloadProgress = 0.0; _statusMessage = ''; }); _urlController.clear(); } } void _showToast(String message) { Fluttertoast.showToast( msg: message, toastLength: Toast.LENGTH_LONG, gravity: ToastGravity.BOTTOM, ); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('YouTube Downloader'), ), body: Padding( padding: const EdgeInsets.all(16.0), child: Column( children: [ TextField( controller: _urlController, decoration: const InputDecoration( labelText: 'YouTube Video URL', border: OutlineInputBorder(), ), ), const SizedBox(height: 20), ElevatedButton( onPressed: _isLoading ? null : _downloadVideo, child: const Text('Download'), ), const SizedBox(height: 20), if (_isLoading) ...[ LinearProgressIndicator(value: _downloadProgress), const SizedBox(height: 10), Text(_statusMessage), ], ], ), ), ); } } To run this app: 1. Create a new Flutter project 2. Replace the default files with these 3. Run `flutter pub get` to install dependencies 4. Run the app on an Android device/emulator (iOS has more restrictions) Note: YouTube's terms of service prohibit downloading videos without permission. This is for educational purposes only.