Just one function for iOS App -Voice Recognition Function-

Hi, I believe this is a very quick and efficient project for experienced programmers. We are looking for iOS programer to make just one function "Voice Recognition Function" like Siri. -We just need NSLog and UILabel (like "Hello World" app) showing text which is recognized from Voice Recognition Function of English language. -Please note, we only offer this project to a programmer who has past experience of making same kind of Voice Recognition Function with good rating of Freelancer.com. -We expect high quality of recognition. If you know several sources (or API, Library) of voice recognition, please explain which is the best. -When you apply, please specify what kind of source or program you will use for this. How many apps using same kind of voice input you made. Please show us web page of the apps you made as an evidence. -We prefer communication via email, not Skype or Phone. -We value competitive bid. -We will use this for English Learning App for Japanese people. So we need good voice input function which even recognize non-native English speaker's voice. If you think you can put this together in a timely and professional manner, please contact me. Best,