Here are a collection of screenshots of Graphulator in action.

The main calculator based user interface.

A graph of sin(x) showing the grid toggled on, and with axis scale lock turned off.

Another graph of sin(x) with the grid, but this time forcing the scale of the x and y axis to be locked together. Notice that the grid is perfectly square.

The table view from the graph page, showing a selection of the actual x and y values.

The settings panel for the graph page.

A graph of a circle.

An interesting graph involving the addition of square roots.