iBooks continues to lead as the most popular free app in the Apple App Store this week, according to Apple. Kindle is the second most popular free book app in iTunes. Barnes & Noble’s Nook app joins the list this week at No. 5. The book retailer’s B&N app remains on the list at No. 13, where it joined the list last week.

Explore these 20 free apps and find out what kind of literary apps succeed in this crowded marketplace. We spotlight the top grossing book apps, the top paid Android books apps and the most popular free apps every week.

Below, we’ve listed the top free iOS apps of the week–linking to iTunes so that you can check out the apps.

20 Top Free Apps (Books Genre)

Wednesday February 29th

1. iBooks

2. Kindle

3. Weird Facts 1000

4. Audible

5. Nook by Barnes & Noble

6. Wattpad

7. Audiobooks

8. Bible+

9. Goodreads

10. Love Quotes 500

11. Sex-Facts 500

12. Books- 23,469 classics to go

13. Barnes & Noble

14. The Cat in the Hat

15. Disney Comics

16. Dirty Sex Jokes

17. Comics

18. Kobo

19. Marvel Comics

20. 100+ Horror Stories