If you own an iOS device that is capable of running iOS version 10 or later with 540 MB free memory, TheSky will run on it. TheSky is not compatible with devices running iOS 9 or earlier.
To find what version of iOS is running on your device, tap Settings, General, About; the Version row shows the current iOS version. Tap Usage under General settings to view how much free space is available.
There are two editions of TheSky: TheSky HD is compatible with iPads and TheSky Mobile is compatible for iPhones. Both have similar feature sets as described below.