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RunKeeper Pro [iTunes link] was the second top-grossing health and fitness app in the App Store in 2010, according to Apple. It made headlines earlier this year when it announced a partnership with Foursquare, enabling RunKeeper users to earn Foursquare badges for completing certain fitness challenges, such as running a 5K or a marathon.
So why is FitnessKeeper forgoing a month's worth of revenue? To increase its userbase, mainly. "Monetization is important to us, but most important is making an incredible system for our users… and getting as big an engaged community as possible using the RunKeeper platform," Jacobs says.