Wax blocks apps and websites on your iPhone from your Mac, without erasing it. Plug the iPhone into your Mac and click Supervise. The iPhone restarts once, then you pick what to block and tap Install. No setting on the iPhone turns the block off, so it holds when Screen Time limits do not. Your photos, messages and apps stay. To undo, choose Remove Supervision in Wax. $9 once for 2 iPhones, or $29 for 5.