Love it. The only odd thing is it has a place to put you age and sex. Not sure how those work with the app. Setting the age was very hard. I am 40 and it wanted 38 or 42.
It uses the flash on the camera to shine through your finger. Pretty cool.
I wish I could set up a profile for me and my wife and track our resting heart rate over time.
jensenbox about Heart Rate - Free, v1.2