I am trying out Wattpad first. It is very easy to get started on. I was pleasantly surprised by finding an old favorite book of mine right out of the gate. The Dirt Eaters is the first book in a really great Science Fiction/Fantasy series. There are some published books here for free! I think this would be a really good app to teach to my students as they don't have transportation or cash and they could find a lot to read here. I am wowed by the amount of reading material there is here. My search for paranormal romance came up with a list of more titles than I could read in a year. There are also suggested lists that would help my students wade through the titles. I really liked this app.
Next I decided to try Audiobooks. I love to listen to books while driving and have a subscription to Audible. I tried the free books out because that is what my students would use and because, well, they are free. I tried three different books and I can not recommend them. The readers are not very good, just serviceable. Still, if you wanted to hear a book read and you didn't want to pay for it, this app would be a good way to do that. I am just too picky a listener. This is a nice alternative for folks that have trouble reading and would like to hear some classics.
I have had the Teen Book Finder on my phone for at least a year, maybe more. I don't find it that useful. I wish it would give a little be longer descriptions of most of the books.