His video received some 100,000 views over just a couple of days. Moss credits Locket’s rapid adoption to going viral on TikTok, where he published videos to an accompanying company account for Locket where he could show off the app in action. but its data is only through yesterday. Apptopia reports only seeing around 1 million global installs so far, with about 31% from the U.S. App Store, per Apptopia’s app store data, and had become the No. The app launched on New Year’s Day, and has now seen more than 2 million users sign up as of this morning. So Moss decided to make Locket publicly available to users on the App Store. Soon, the couple’s friends started taking notice and asked if they could use it with their own significant others, family or friends. As Locket also stores the photos sent and received in its history section, the app became a fun way to look back on their photos, as well. The developer build the app over a week or two and ended up using it with his girlfriend fairly extensively over the past six months, sending each other an average of five photos per day. “The process of getting a little photo from her on my homescreen…seemed really appealing. “She was going back to school in the fall, so we were about to start a long-distance relationship,” he says. “I built it as a present for my girlfriend for her birthday last summer,” Moss explains. Locket, he admits, was originally a personal side project - not his main focus. The idea for the app was dreamed up by Matt Moss, a former Apple Worldwide Developer Conference student scholarship winner and recent UC Santa Barbara grad, who had been building a user research and testing platform called Hawkeye Labs. In other words, it turns Apple’s widget system - typically used to showcase information like news, weather, inspirational quotes or photos from your own iPhone’s gallery - into a private social networking platform. A new social app, Locket, popped to the top of the App Store charts in recent days thanks to its clever premise to put live photos from friends in a widget on your iOS homescreen.