Quote from the book "Как покупать дешево и продавать дорого. Пособие для разумного инвестора"

Suitable for smartphones, Android tablets, e-readers (except Kindle) and many programs

Opens in Adobe Reader

Optimized and suitable for smartphones

Suitable for iOS devices (iPhone, iPad, iMac) and most reading apps

Development of FB2 format

Suitable for Kindle e-readers and Android apps