Please confirm that you are selecting the Breezing Tracker for the right device at checkout. The Breezing Tracker for iOS will not work with Android devices, and the Breezing Tracker for Android will not work with iOS devices.
Requires iOS 9 or later for iPhone 4s and up. The latest Breezing App can be downloaded from the App Store here.
Breezing also works with iPad (3rd generation and newer, including all iPad Air and iPad Mini models). Just search "iPhone Only" in the App Store.