not that good
Im currently enjoying an irregular heart rate, to the point that my exercise heart rate monitor has ceased to operate properly. The iphone app "Instant Heart Rate" by Azumio has been capturing and even recording a graph of the test, which is showing an irregular, incomplete pulse, i.e. a skipping of the heart beat mid stroke or something sometimes as frequently as every third or fourth beat. Also, it also seemingly displays a much more detailed graph of each pulse. I thought I might get a better result with an app designed for my laptop, or even be able to export the result, but no luck. all it does is show a series of spikes on a graphic representation of an electrocardiograph machines tape - no real info except the timing of peaks of pulse. This app finally captured the heart rate after about 25 attempts, LOL vs maybe a 75% success rate with the Azumio app during this challenging situation that I present to these apps :) Also, its much easier to rest the iphone on ones fingertip instead of holding ones finger against the MBA screen bezel.
SoarHighly about Cardiograph, v1.1