Chessify, the Armenian app for learning, playing and analyzing chess created by Fimetech is already available on App Store.
It is for free and you can use it to scan the example from the book, digitize it and move the pieces, which will visualize your possible moves.
The app loads even with the slowest internet connection.
Chessify became available on Google Play in August 2016. In 2017, the app won the national competition in Seedstars.