This is the most simple pedometer app! You can get walk steps simply. M7/M8 chip have only 7days steps. This app run in background once in a day. If you don't run this app for a long time, background fetch may stop. Please run this app at lease once in a week. This app is made for iPhone5s, 6, 6 Plus, 6s, 6s Plus. This app use M7 chip on iPhone5s or M8 chip on iPhone6, iPhone6 Plus.