I really want to do Math Academy and even briefly tried it a year ago. It's absolutely great but it's also very expensive. I know that math skills are invaluable, it's far cheaper than schooling, and that long term the investment is likely to pay for itself but when you're skint $49/month is still a pretty hefty sum, especially if you live outside of America. For context in the UK, a basic gym membership (£17/month) and a SIM only phone plan with unlimited data (£22/month on a two year contract) only costs £1 more in total than Math Academy (£38/month). I can't help but feel that the people who would benefit from it the most are also the people least likely to be able to afford it.