My oldest is using the free brilliant.org (math and such) service but I guess it's going well and my partner suggested we get a real/paid account for him. It's $20/mo!
But, this is one of those services that flood youtube with sponsorship codes ("visit brilliant.com/whatever for 30% off!" or whatever).
Does anyone have a good and reputable youtuber/"content creator" who has an active discount code I should use?
EDIT: So far Veritasium has one for 20% off which I'll used this evening with my kid to sign up unless someone recommends a better discount and/or person to get the referral reward.