Goodreads: Of course this is my number one favorite app. I use this at least once a day if not more. It is a condensed version of their regular website. I use this to track all my books that I am reading, scan books in bookstores that I want to read and look up book reviews. Plus, when I am at the library I can look up books on my to read list to check out. Also, the app has a library of public domain ebooks. I don't love reading an actual book on my iPhone since the screen is so small but I definitely will on my iPad.
Overdrive: This app works in conjunction with my local library. It has a database of audiobook and ebooks. I absolutely love this app! I listen to audiobooks whenever I am cleaning or editing photos. They have a decent selection based on the particular library you are a member of. Check out your library to see if they participate with Overdrive.
Free Audiobooks: This is one of my favorite apps because it is a bunch of free public domain audiobooks. Librivox is a website that offers free public domain audiobooks read by members of their community. This is so amazing and I love it. You can also volunteer to be a reader! Some of the readers can make you wish the chapter was over more quickly but I am not complaining over this wonderful free service. Definitely check it out!
I would love to hear about your favorite book apps. I always have room for more! Tell me your favorite apps in the comments and thanks for reading.