I think they need something like this that is built right into your shoe. I feel like it is hard for these apps to get an accurate reading when they are in your pocket or not on a part of your body that is actually moving. I guess I am not sure how sensitive the sensors are in your phone to see if it can accurately measure movement. I think it is awesome that more and more of these apps are coming out though. We could all stand to be a little more active! Nice hunt!