Yes, Math Academy is insanely good. It's a lot more intense, focused learning and less edutainment.

I'm an adult and not a kid, but wrote about my experience after 100 days of using it daily here: https://gmays.com/math

The Math Academy team (including the founders) are also active on X/Twitter: https://x.com/_MathAcademy_

And there's a Math Academy community on X here in case you want opinions from other users: https://x.com/i/communities/1833198423593431339