Sophie TutorTeach me the chain rule.Sophie TutorI don't get L’Hôpital’s rule. Can you show me?Sophie TutorHelp me set up an optimization problem.

Sophie Tutor opens an interactive AP Calculus lesson next to the chat. Each lesson moves one step at a time: an animation shows the idea, a short text explains it, and multiple-choice questions check understanding. A wrong answer explains the mistake and lets the student try again; a right answer shows why it is right. At the end, the student sees a short summary and a score. Lessons cover AP Calculus AB and BC topics: limits and continuity, average and instantaneous rates of change, derivatives from the definition, the product rule, the chain rule, higher derivatives, L’Hôpital’s rule, optimization, u-substitution, definite integrals on a calculator, differential equations from word problems, and area in polar coordinates. It is for high-school students who take AP Calculus, and for anyone who wants to review a calculus topic visually. Sophie Tutor only opens a lesson when one matches the topic; for other topics, ChatGPT helps as usual. It needs no account and collects no personal information.