Quote from the book "Счастливый карман, полный денег. Бесконечное изобилие здесь и сейчас. Дэвид Кэмерон Гиканди. Кратко"

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

Accessible from nearly any device

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Works on any computer

Opens in Adobe Reader

Optimized and suitable for smartphones

Suitable for Android apps

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

Perfect for iPhone and iPad

Development of FB2 format