The compatibility depends on what you want to observe and your smartphone’s OS (Operating System) If you are using an Apple iPhone: Sun & Moon: iPhone under iOS 16 and above, or iPhone 8 and above. Deep Sky: iPhone 13 and above Please note that only iPhone SE 2nd and 3rd Generations are compatible. iPads are not supported. If you are using an Android smartphone: Sun & Moon: Download the Gravity by Vaonis app. Deep Sky: Phone list below  SAMSUNG: Galaxy S22 Ultra, S23 Ultra, Galaxy S20 and above  GOOGLE: Pixel 5, Pixel 6, Pixel 7 and above  XIAOMI: Xiaomi 12, Xiaomi 13 and above  OPPO: Find X3, Find X5, Find X6 and above Please note that tablets and Chromebooks are not compatible. If you are not able to find the Gravity by Vaonis app in your store (Google app store or App store), that means your phone is not compatible at all.