Kindle ousts iBooks as the most popular free app in the Apple App Store this week, according to Apple. iBooks is the second most popular free book app in iTunes. Lite versions of various Dr. Seuss story apps took over the list this week, following the children’s author’s birthday celebrations 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 March 6th

1. Kindle

2. iBooks

3. The Cat in the Hat – Lite

4. Green Eggs and Ham – Lite

5. Audible

6. Weird Facts 1000

7. Nook by Barnes & Noble

8. Wattpad

9. The Smurfs

10. Audiobooks

11. Dr. Seuss’ ABC’s – Lite

12. Quotes

13. Books- 23,469 classics to go

14. Bible+

15. Goodreads

16. Disney Comics

17. Love Quotes 500

18. Kobo

19. Barnes & Noble

20. Marvel Comics