This app keeps track of your heart rate with a series of graphs and charts. It also tells you how your heart rate stacks up to other average heart rates in the US. How exactly does the app do all of this? Cardiio uses your phone's camera to analyze the amount of light reflected off your face – an increase in blood volume to your face means an increase in blood pressure. According to Cardiio, the reflection allows your heart rate to be measured. This app might also be good for stressful business meetings....
Compatibility: iPhone and iPad
Cost: $1.99
