The Azure Code Samples are currently available in English

September 2018: New Microsoft Cognitive Services Speech SDK available

We released a new Speech SDK supporting the new Speech Service. The new Speech SDK comes with support for Windows, Android, Linux, Javascript and iOS.

Please check out Microsoft Cognitive Services Speech SDK for documentation, links to the download pages, and the samples.

NOTE: The content of this repository is supporting the Bing Speech Service, not the new Speech Service. Bing Speech Service has been deprecated, please use the new Speech Service.

Microsoft Speech API: iOS Speech-to-Text Client Library and Samples

This repo contains the iOS client library and samples for Speech-to-Text in Microsoft Speech API, an offering within Microsoft Cognitive Services on Azure, formerly known as Project Oxford.

The Client Library

To add the Speech Client Library dependency to an existing XCode Project:

  1. Select your target application, and open the menu File then Add Files to ...
  2. Navigate to iPhoneOS, select SpeechSDK.framework, and click Add.
  3. Go to your project settings, by single clicking your project, and navigate to the General tab. You will notice that SpeechSDK.framework exists under the Linked Frameworks and Libraries section.
  4. In the General tab, under the Embedded Binaries section, click the (+) button. In the dialog, select SpeechSDK.framework and click the Add button.
  5. If you wish to run on the iOS Simulator or MacOSX, repeat steps 2-4 but choose either iPhoneSimulator or MacOSX instead.

The Client Library Reference for iOS can be found here.

The Sample

This sample demonstrates the following features using a wav file or external microphone input:

  • Short-form recognition
  • Long-form dictation
  • Recognition with intent

Build the sample

  1. First, you must obtain a Speech API subscription key by following the instructions on Subscriptions.
  2. Start XCode and choose the menu File, and Open... the workspace file Cognitive-Speech-STT-iOS > SpeechSDK.xcworkspace.
  3. Use one of your subscription keys as the primaryKey in Samples/SpeechRecognitionServerExample/settings.plist.
  4. If you want to use Recognition with intent, you also need to sign up for Language Understanding Intelligent Service (LUIS) and set the key values in luisAppID and luisSubscriptionID in Samples/SpeechRecognitionServerExample/settings.plist.
  5. In XCode, select menu Product > Build to build the sample and Run to launch the sample app.

Running the sample

In XCode, select the menu Product, and Run to launch this sample app.

  1. In the application, press the button Change Mode to select which recognition mode you would like to use.
  2. To Start recognition, press the Start button.


We welcome contributions. Feel free to file issues and pull requests on the repo and we'll address them as we can. Learn more about how you can help on our Contribution Rules & Guidelines.

You can reach out to us anytime with questions and suggestions using our communities below:

This project has adopted the Microsoft Open Source Code of Conduct. For more information, see the Code of Conduct FAQ or contact with any additional questions or comments.


All Microsoft Cognitive Services SDKs and samples are licensed with the MIT License. For more information, see LICENSE.

Sample images are licensed separately, please refer to LICENSE-IMAGE.

Developer Code of Conduct

Developers using Cognitive Services, including this client library and sample, are expected to follow the "Developer Code of Conduct for Microsoft Cognitive Services", found at