Couple shortcomings make for lower rating. 1) no ability to define always available apps. I set daily time limit on my kid's phone, but need him to be able use WhatsApp and SMS always. Can't do, phone just locks, only thing you can do is emergency numbers. 2) on PC it is possible to extend time beyond limit by rebooting. It only gives you about 4-5 mins every time, but kids will try anything. 3) time extension clunky. no ability to just "give +15 mins to what he has now".