After a tornado leveled Moore, Okla., last year, firefighter Shonn Neidel (left) developed an app that helps first responders locate storm shelters under the wreckage. Courtesy of Shonn Neidel hide caption

itoggle caption Courtesy of Shonn Neidel

He's not checking your blood glucose levels. He's playing Words with Friends. Anna Zielinska/iStockphoto.com hide caption

itoggle caption Anna Zielinska/iStockphoto.com

Popular online games like FarmVille use powerful reward systems to get players to spend real-world money on virtual items. Zynga/AP hide caption

itoggle caption Zynga/AP

How many calories in that bite? My Fitness Pal and other fitness and nutrition apps can help find the answer. Heather Rousseau/NPR hide caption

itoggle caption Heather Rousseau/NPR

Drinks columnist David Wondrich is seen on Esquire's new Talk to Esquire app, which allows users to interact with several of the magazine's columnists through voice recognition. Screengrab via YouTube hide caption

itoggle caption Screengrab via YouTube

University of Washington computer science student Laura McFarlane and her team work on their smartphone app aimed at helping girls being illegally trafficked get help. Sara Lerner/NPR hide caption

itoggle caption Sara Lerner/NPR