Great but flawed
The free version is excellent. Its extremely customizable and a pleasure to use, especially for reading books in foreign languages. But if you buy the "pro version" hoping to synchronize devices, dont waste your money. See the developers website to read all the comments from disappointed users (its in Russian, so youll have to use Google Translate.).
Spadina about
KyBook - EPub,FB2,PDF,DjVu Reader, v2.0.7