Here are some apps that I found to be exciting when it comes to books and reading:

1) Goodreads- Here you can start a book challenge, join groups, and see book recommendations.

2) Read More- Again, you can set book goals, keep track of how many pages you read and how many books per month among other statistics

3) Bookly- This one is basically the same as Read More but it only limits you to ten books unless you go pro which you must pay for!