ClassPad is a CASIO calculator app equipped with many powerful functions for the study of mathematics.  It comes equipped to perform complex calculations, draw graphs, and to use a computer algebra system (CAS) to investigate mathematics and solve problems.  It has a user interface in the style of the handheld ClassPad, a tool used in classrooms worldwide.

A monthly subscription fee is required in order to enable full use of all ClassPad functionality.
See here for further details (English).