Compatible with iPhone, iPod touch, and iPad. Requires iOS 6.0 or later. This app is optimized for iPhone 5. Also compatible with Android devices. [1]
This app aims to help kids learn all about letters and numbers including writing, counting, phonics and more. The app helps kids learn a letter’s name, its sound, as well as words to go with it.
Links:
[1] https://play.google.com/store/search?q=letter%20school&c=apps
[2] https://itunes.apple.com/us/app/letterschool/id435476174?mt=8