Quote from the book "Прикладная продуктология. Часть 1. Анализ потребностей и проектирование продукта"

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

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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