Photographer: Tony Avelar/Bloomberg

The Top-Selling Apps You've Never Heard Of

From motorcycle roars to condensed books

You can tell a lot about someone by his iPhone home screen. A teenager may have more games than an older millennial, who may have more social networking apps than a boomer. There are also differences among nations. Apple's App Store has users registered in 155 distinct countries and territories, and although such apps as Candy Crush and Spotify are top-sellers the world over, some regions have wildly popular apps that barely rate a mention in other markets.

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