AoPS isn't a 'fun math game' in the way most apps pretend to be. It’s actual, rigorous work. If your kid is bored in school because math is too easy, this is the antidote. Beast Academy (the younger sibling) uses a comic-book style that’s genuinely engaging, but once they hit the main AoPS site, the training wheels come off.

It’s the best way to teach a gifted kid that they aren't actually the smartest person in the world—and that’s a good thing. Just be prepared for some 'productive struggle' tears. It’s not for every kid, but for the ones who 'get' it, it’s a life-changer. It's high-quality, safe, and arguably the most enriching thing you can put on a screen.