İşler Mobil Kütüphane is a free online application that can be used to download books in a very simple and fast way. The application is designed to work with Android smartphones and tablets and works perfectly on all of them. The application is free, and there are no subscription fees. You can use it on any device with an Internet connection.

Each book available in this app has data from 50 mbar to 7MB so make sure that you have enough storage if you plan on downloading more.