If you're looking to make money on an app of your own, your best bet is a freemium model. In seven of the Apple App Store's 10 largest categories, the majority of revenue comes from in-app purchases in free apps.
But there are a couple of exceptions: Just 22% of revenue earned by navigation apps and 29% of revenue from productivity apps purchased between January and November 2013 were via freemium models.
See also: 10 Best Apps for Navigating a New City
Statista's chart, below, breaks down the revenue of each of the App Store's 10 primary categories, between freemium apps with in-app purchases, paid apps and paid apps with in-app purchases.
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