Very helpful and easy to use – Calculus FTW - Deep Insight into Solving Calculus Problems Review

I'm taking AP calculus ab and this app helps out a great deal. It has like every rule that I learned in class and is faster to access than go through a textbook. Definitions and reasons are also covered here.
Review by Tofuking on Calculus FTW - Deep Insight into Solving Calculus Problems.