They are doing post requests to there own servers, for recognition. reference: http://src.chromium.org/viewvc/chrome/trunk/src/chrome/browser/speech/speech_rec

They are doing post requests to there own servers, for recognition. reference: http://src.chromium.org/viewvc/chrome/trunk/src/chrome/browser/speech/speech_recognition_request.cc?content-type=text/plain http://src.chromium.org/viewvc/chrome/trunk/src/chrome/brows... api url: https://www.google.com/speech-api/v1/recognize https://www.google.com/speech-api/v1/recognize