There are a handful of decent e-reader apps on iOS right now, and unfortunately a few of the best, like KyBook, are dead and no longer being maintained. Of the

There are a handful of decent e-reader apps on iOS right now, and unfortunately a few of the best, like KyBook, are dead and no longer being maintained. Of the available options now, the best two IMO are either Apple's own Books app or Yomu EBook Reader. ReadEra is also pretty good.