I n 2009 , Apple coined a catchy slogan: “There’s an app for just about anything.” The original commercial is a time capsule from the early years—when the idea that smartphones could be used in every corner of life read more as a promise than a threat. Now we have apps to help us stop using apps. The deterrents are creative. Some apps slow down how quickly we can open others; some block everything except calls and texts until we enter a specific password; some prompt us to reflect on a mantra