Calc101's user interface is intuitive and easy to use. Functions can be explored dynamically by manipulating sliders that control general parameters. Plots can be cut and pasted into other plots to allow for easy comparisions of functions.
Calc101 allows for the exploration of core functions, from the basic linear equations to quadratic equations (in vertex and generic form) to sophisticated trigonometric functions, most of the array of needed functions for an algebra to precalculus or calculus course are available at the touch of a button (and a few sliders...).
Calc101's graphs can be exported to other applications like Email, or to the Photo Library. Every function also provides a table of values, generated dynamically for each plot, along with brief description of the main properties of the function, with some examples.