Very powerfull and userfriendly simulation.I like the feel of a calculator on a PC.And this one does it very well.What is further needed is a scripting or programming language, I think...But that apart it's a very good and complete calculator.

The free internet version was useless. It did not even give the user enough autonomy to enter data points and have the graph plot them. One cannot tell if this product is worth buying by using the free version because it is so pathologically afraid of the user getting free use that nearly every function brings up a dialogue box requesting the user pay for an upgrade, which I might have done if I could tell how useful the product might be, and how smoothly it ran. I understand the fear of free loaders but I've never seen anything like ...

This supposedly freeware program requires me to upgrade in order to import my data to plot graphs. Of course I am able to key in the values manually but it all defeats the purpose of the trial.

I have downloaded activex from microsoft but still couldn't see the graphs so I uninstalled the program.

A great free program I was looking for a graphics calculator which is free. This gives more than what I was expecting with the 3-D shaded graphs which one can rotate and zoom and color.

Graphing Calculator 3D I like it ! Very useful very simple to use!

The graphics are good, but so far I have not been able to import and use x,y,z-data from Excel, an advertised feature. Manual entry works OK, but I\'ve got 300+ data points that I\'ve already entered manually into Excel. Aaaarrrgghhh!

The app really good. I\'m satisfied with this

great stuff I am in the process of learning how to use this great tool would recommend it to anyone who needs to graph data or for recreational purposes as far as that goes. Thank you (more to follow upon further use)