iReadItNow is an app for Apple Devices only. It allows you can scan the barcodes to create your own personal library. You can type notes into the app and share your book details with others. You can also download this iPhone app to your iPad (tick iPhone Apps in the App store).
Login: Not Required
Size: 12 MB
Goodreads is a personal library of books you have read or want to read. Create a free account or sign in using your Facebook, Twitter, Google or Amazon account.
Size: 30 MB