What it is
Shelfy Reader opens the formats a real library actually contains: EPUB, PDF, MOBI, AZW3, CBZ and CBR comic archives, FB2, DOCX and a dozen more, without converting anything first.
The reading help runs on the phone rather than in a datacentre. Ask it to explain a word, summarise the chapter you have just finished, remind you who a character is, or quiz you on what you have read, and the answer is computed locally — so it works on a plane and costs nothing per use.
Around the reader sit the things that make a book stick: offline translation in more than forty languages, text-to-speech, bionic reading, a vocabulary builder with flashcards, reading statistics, cloud sync and OPDS catalogue support. It is free and ad-free, with no trackers in it.