iBooks was 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)

1.	iBooks
2.	Kindle
3.	NOOK for iPhone from Barnes & Noble-Read 2 Million Books, Free Books
4.	Audible
5.	Sherlock Holmes w/ Booktrack (Soundtracks for Books) – Speckled Band
6.	DC Comics
7.	Weird Facts 1000
8.	Audiobooks
9.	1 million FREE Books – Read Kobo eBooks!
10.	Comics
11.	Unlimited Free Books – Wattpad eBook Reader
12.	Bible+
13.	OverDrive Media Console – Library eBooks and Audiobooks
14.	Dirty Sex Jokes
15.	B&N Bookstore
16.	Love Quotes 500
17.	Marvel Comics
18.	Google Books
19.	Sex-Facts 500
20.	100+ Horror Stories