If you need to have the most important derivatives or integrals always with you, than this is the right kind of application for you. This application features 26 essential derivative expressions and 21 essential integral expressions. Both types of expressions are arranged in 5 easy accessible groups. Each group can be accessed from the main menu screen, or from the selected group screen using the topside quick access bar. Landscape orientation mode is supported, but primary mode is Portrait orientation mode. Compatible with S^3 / Anna / Belle Smart Phones.