- Mark Wilson: Locket, the #1 app in Apple’s App Store, uses a trick hiding in plain sight. The photo sharing app isn’t just a viral sensation. It figured out how to use widgets the right way. https://www.fastcompany.com/90712709/locket-the-1-app-in-apples-app-store-uses-a-trick-hiding-in-plain-sight 72 comments apple