Book Suggestions Ninja searches 2,781,659 books to give the best recommendation of what to read next! Book Suggestions Ninja avoids five common problems with book recommendation services. Basically: it never suggests sequels, it keeps authors diverse, it uses probabilistic genres, it is not based on preferences of others, and it is made to be fast and simple. There is no sign up, just suggestions. You can read more about Book Suggestions Ninja here.


