The iOS app Oh My Hours takes a new approach to curbing screen time. It splits up your day into hour-long blocks, then shows which ones you wasted on Instagram and TikTok.

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You know that phone addiction has become a big issue when even Google and Apple are bundling time management tools into their handsets—Digital Wellbeing and Screen Time, respectively. There are now also a plethora of apps looking to help you cultivate a healthier relationship with your device.

One of the newer ones, which takes a slightly different approach to the norm, is Oh My Hours for iOS. (There's no sign of an Android version yet.) Rather than giving you a mass of menus and options to wade through, it simply splits each day into blocks of hours that you can either waste or use productively, then puts a black mark next to the hours during which your phone has distracted you.

It's simple, it's effective, and it just might work.…