**This app is designed to work with the iPhone 5S only**'Calories M7' is a very simple app which displays your activity and calorie count in last 7 days.Unlike other fitness apps, 'Calories M7' doesn't need to be running in the background to track your activities.Your activity data is collected by M7 motion co-processor in the iPhone 5S without using a significant amount of battery power. So you can view your activitie graph for the last 7 days, even if you have never installed this app before. Set your weight, age and female/male.When you need information, just launch this app.By monitoring at your daily activity, you can get an idea of how active you have been a week. Please email us if you have any feature requests or problems, since we can not answer your comment thru customer reviews. Thanks! **This app is designed to work with the iPhone 5S only because other iPhone device has no M7 chips**