iBooks continues to lead as the most popular free app in the Apple App Store this week, according to research from AppData, Inside Network’s data service that tracks app and developer leaderboards.

Explore these 20 free apps and find out what kind of literary apps succeed in this crowded marketplace. To prepare for Mediabistro’s upcoming Publishing App Expo on December 7-8, 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 App Data’s research about each individual app, including historical charts, developer information and download details.

20 Top Free Apps (Books Genre)

Wednesday November 30th

1. iBooks iBooks
2. Kindle Kindle
3. NOOK for iPhone from Barnes & Noble-Read 2 Million Books, Free Books NOOK for iPhone from Barnes & Noble-Read 2 Million Books, Free Books
4. Christmas Tale HD Christmas Tale HD
5. Audible Audible
6. Sex-Facts 500 Sex-Facts 500
7. Weird Facts 1000 Weird Facts 1000
8. Unlimited Free Books – Wattpad eBook Reader Unlimited Free Books – Wattpad eBook Reader
9. B&N Bookstore B&N Bookstore
10. Audiobooks Audiobooks
11. Dirty Sex Jokes Dirty Sex Jokes
12. Love Quotes 500 Love Quotes 500
13. Comics Comics
14. 1 million FREE Books – Read eBooks! 1 million FREE Books – Read eBooks!
15. 100+ Horror Stories 100+ Horror Stories
16. Beauty Secrets 1000   Beauty Secrets 1000  
17. Bible+ Bible+
18. Disney Comics Disney Comics
19. OverDrive Media Console – Library eBooks and Audiobooks OverDrive Media Console – Library eBooks and Audiobooks
20. Christmas Shareable Book - Wacky Version - The Coolest Interactive Story Greeting Book HD Christmas Shareable Book – Wacky Version – The Coolest Interactive Story Greeting Book HD