I'm not sure but I use Runkeeper. It helps me lose weight in the sense of monitoring how much calorie I lose when running or doing other workout. So, this app is like a trainer who encourages me to go for more. There's this one time when after I ran for 9.35 miles (burned about 335cal), I stopped by a convenience store and was about to buy an iced tea but when I checked the total calorie for the whole bottle of iced tea, I was shocked that it has about 150cal. See the logic here, for that 9.35 miles run, I only burned 335cal. So, I will not waste a tiresome 9.35 miles/burned 335cal, for a bottle of iced tea with 150cal in it. I never knew about calorie counting before, but when I started to use Runkeeper, I am aware now and conscious about how much calorie I took.