Speech Recognition in Uno


This article covers Uno-specific information for Windows.Media.SpeechRecognition. For a full description of the feature and instructions on using it, consult the UWP documentation: https://learn.microsoft.com/en-us/uwp/api/windows.media.speechrecognition

  • The Windows.Media.SpeechRecognition class allows an application to recognize voice input.

Uno's implementation currently supports basic native speech recognition.

Supported Features

Following features of Windows.Media.SpeechRecognition.SpeechRecognizer are currently supported:

Feature iOS Android Remarks
SpeechRecognizer() X X
SpeechRecognizer(Language) X X
Constraints - -
ContinuousRecognitionSession - -
CurrentLanguage X X
State X X
SupportedGrammarLanguages - -
SupportedTopicLanguages - -
SystemSpeechLanguage - -
Timeouts X X
UIOptions X X Not used
CompileConstraintsAsync() X X Always return Success (implemented to meet UWP constraint that requires CompileConstraintsAsync() to be called before RecognizeAsync())
Dispose() X X
RecognizeAsync() X X
RecognizeWithUIAsync() - -
StopRecognitionAsync()() X X
TrySetSystemSpeechLanguageAsync(Language) - -
HypothesisGenerated X X
RecognitionQualityDegrading - -
StateChanged X X



Requires iOS10+ Following lines need to be added to your info.plist

<string>[SpeechRecognition usage description]</string>  
<string>[SpeechRecognition usage description]</string> 


Following lines need to be added to your AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />


In Windows.Media.SpeechRecognition.SpeechRecognitionResult, only Text, Alternates and GetAlternates(uint maxAlternates) are implemented. In particular, RawConfidence and Confidence fields are not currently supported