This app is a friendly introduction to Calculus. It is suitable for senior secondary students with little or no prior knowledge to Calculus. In this app, you will be introduced to functions, limits, differentiation, integration and differential equations. Each chapter contains videos and practice quizzes. The videos explain concepts and applications, while the quizzes help you to learn by practising. After going through the app, you will be able to apply some Calculus techniques and to construct simple models involving rates of change.