This program has recently been on the first line in appStore. Judging from the description, it measures the frequency of the pulse through the microphone as the built in iphone and headset. However, my attempts to get any closer to actual results or to nothing. Each new meaning in different times. Apparently the sensitivity of the microphone for this purpose is not enough. The program still exists a semi-automatic mode. Signals indicated the time interval for which you are required to calculate the number of heartbeats, and then enter that number and get a result. Perhaps it is the most accurate method.

Download ipa
http://depositfiles.com/files/8790313