Voice Recognition Flutter: Building a Flutter Voice Recognition Interface [2023]


The incorporation of voice recognition technology has become a game-changing factor in the ever-changing app development scene. Google’s UI toolkit, Flutter, offers a smooth platform for voice-activated interface creation in natively built applications. As we herald in a new era of hands-free user experiences, we’ll travel through three different approaches to constructing a Flutter Voice Recognition Interface in this lesson.

Voice Recognition In Flutter

Why Voice Recognition in Flutter?

An inventive and approachable replacement for conventional touch-based interactions are voice-activated interfaces. Developers of Flutter apps can improve user engagement, accessibility, and convenience by using speech recognition. Voice commands elevate the user experience, whether they are used to navigate via an app, dictate text, or manage smart home appliances.

Voice Recognition In Flutter

In flutter there are a number of ways to implement voice recognition In flutter, and we are gonna discuss three of them in this article.

1. Basic Voice Input with Flutter’s Speech Package:

Start your voice recognition journey with Flutter’s built-in speech package. This package simplifies the integration of basic voice input functionality. Follow these steps to get started:

Why choose basic voice input?

Simple voice input provides a rapid and effective option for voice commands and applications where complex language processing is not required.

// Add the 'speech' package to your pubspec.yaml file
  speech: ^0.6.3

// Run 'flutter pub get' in your terminal

// Import the 'speech' package in your Dart file
import 'package:speech/speech.dart';

// Implement basic voice input
void startListening() async {
  SpeechRecognitionResult result = await speech.listen();

This code snippet demonstrates a basic implementation for capturing voice input using Flutter’s speech package.

2. Natural Language Processing with API.ai (Dialogflow):

By incorporating natural language processing with API.ai, now known as Dialogflow, you may advance your voice recognition technology. With Dialogflow, your app can comprehend and react to intricate voice commands. Follow these steps:

  • Create a Dialogflow agent and obtain the API key.
  • Use the http package to make API requests to Dialogflow.
  • Parse the response to extract meaningful information.

Why opt for natural language processing?

For applications requiring nuanced interactions and the ability to comprehend user intents in a more sophisticated manner, natural language processing provides a robust solution.

// Add the 'http' package to your pubspec.yaml file
  http: ^0.13.3

// Run 'flutter pub get' in your terminal

// Import the 'http' package in your Dart file
import 'package:http/http.dart' as http;

// Implement natural language processing with Dialogflow
Future<void> processVoiceCommand(String voiceInput) async {
  // Make API request to Dialogflow
  final response = await http.post(
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer YOUR_DIALOGFLOW_API_KEY',
    body: '{"query": "$voiceInput", "lang": "en"}',

  // Parse and handle the response

3. Offline Voice Recognition with Flutter’s Pocketsphinx:

For scenarios where internet connectivity is limited, Flutter offers an offline solution with the pocketsphinx package. Implement offline voice recognition using the following steps:

Why consider offline voice recognition?

For scenarios where internet connectivity is limited or when privacy concerns arise, offline voice recognition offers a reliable alternative.

// Add the 'pocketsphinx' package to your pubspec.yaml file
  pocketsphinx: ^0.6.0

// Run 'flutter pub get' in your terminal

// Import the 'pocketsphinx' package in your Dart file
import 'package:pocketsphinx/pocketsphinx.dart';

// Implement offline voice recognition
void startOfflineListening() {
  final SpeechRecognizer recognizer = SpeechRecognizer(PocketSphinxRecognition());
    onResult: (SpeechRecognitionResult result) {
    listenFor: Duration(seconds: 10),

This snippet showcases how to set up offline voice recognition using Flutter’s pocketsphinx package.


Your Flutter apps can benefit from adding speech recognition to embrace the era of hands-free interaction. Flutter offers a flexible framework to construct engaging speech-activated interfaces, regardless of whether you choose to use offline voice recognition with Pocketsphinx, natural language processing with Dialogflow, or basic voice input. Improve user experiences and continue to lead the way in innovative mobile app development.