For Amazon Fire Tablet users, the biggest disappointment is probably the smaller Amazon App Store selection compared to what you would get from the Apple App Store or Google Play for Android. Nowadays, an App is the way different devices like the Zepp sensor and the Amazon Fire HDX 8.9 can communicate and work with each other.
Unfortunately for Amazon Fire Tablet and Zepp users, there is no Zepp App available on the Amazon App Store. For now, Zepp users will have to stick with Apple and Android phones and tablets.