It is a smart reading management book flip (BookFlib). We support your reading! ^^ Easily create your own study! Please look for'books that have been read a lot', not just'books that have been sold a lot', and look at books similar to me ^^ Multi-device era! Don't worry about backup anymore! Bookflip does not store all data on the device, but on its own server, and you can use all functions simultaneously on various devices. [My own study with fingers] -Provides bookmarks and star rating fu