Terrific app for calculus
This is an extremely polished and well-developed app. Im quite surprised to find something like this on the App Store. I have a PhD in math and am using this app to help tutor some math students. The quizzes and videos are all designed to be very helpful and pedagogical. And after going through about six quizzes I havent found a single error so far. I highly recommend this to anybody studying college or AP level calculus.
Saragreen44 about
Calculus X: College and AP Calc Test Prep and Tools