I agree that at this point, it's completely unsuitable for the staples of college mathematics (e.g. calculus, differential equations), although it was not clear

I agree that at this point, it's completely unsuitable for the staples of college mathematics (e.g. calculus, differential equations), although it was not clear non-mathematicians were being subject to any sort of rigor anyway. That said, these tools have been used to teach Freshmen CS majors, and to reasonably good effect.