Don’t you hate it when you’re reading something intently on your phone and suddenly the screen turns black and goes to sleep because you haven’t tapped the glass in a while? Samsung’s Smart Stay feature uses your phone’s webcam to determine that you’re still staring at the screen and reset its timeout. Fortunately, you don’t need a Samsung phone to get this functionality.
Alternative: SmartStay Ex, a free app, provides the same functionality, with more options than Samsung offers. Where Samsung just has a check box in the Android display settings menu to enable its Smart Stay, the SmartStay Ex app lets you decide how frequently the app looks for your face and how many times it must fail to see your mug before letting the system sleep. I particularly like the icon SmartStay Ex puts in the status bar, which changes color to show you whether it has detected your face. A Pro version gives you even more options.