Mobile app stores (iOS and Google Play) grew revenue by 2.3 times in 2013, while mobile in-app ads grew at 60 percent, outpacing the 50 percent growth for mobile browser ads and the 10 percent growth for PC browser-based ads. About 40 percent of developers use in-app ads in their apps. Mobile apps, especially games, are monetizing well through free-to-play (a kind of freemium model) and in-app ads.
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