More released on the App Store last month than games.
One out of every five iPhone apps that launched in October was an e-book, according to analytics firm Flurry.
The company has been tracking the growth of the Books category on the App Store, claiming in September that the number of new apps in the Books category outpaced Games for the first time.
In October, 20% of new apps were books according to Flurry, compared to 13% of new apps that were games. The company claims iPhone is set to provide competition for Amazon's Kindle e-reader, just as it has for Nintendo's DS and Sony's PSP in the games sector.
Meanwhile, Flurry has identified a new mobile user demographic: addicts - defined as people who fire up a single application more than 100 times a month.
Flurry says that 1.2% of the 40 million users that it tracked in September fell into this category - around half a million people.
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The company's full Smartphone Industry Pulse report for October can be downloaded here.
