To sync between device, or between your Android device with an iPhone or iPad you need to be subscribed to iTrackBites Pro which you can choose to do through either platform. Once subscribed, make sure you're logged into both devices with the same iTrackBites account and you have your sync settings set to "Auto". From there, any changes you make to one device will within a couple minutes be reflected on your other device(s). The app waits up to 2 minutes between syncs in order to reduce it's impact on your device battery.