I would LOVE to have this as a portable calculator app, but the thing is I don't want to use data on my phone. I would love to have this as a portable calculator so that I can work out what I want to know with this powerful tool. The other calculator apps don't exactly hold my favor :/ and real graphing calculators....need better graphics. I would easily pay $20 or $30 for a good, easy calculator. A bigger plus would be if you could have the input write itself similar to the Casio fx-300ES PLUS calculator. I have had this calculator since 12th grade in high school, and I am in my second semester of college with Calculus I with Analytical Geometry, and I don't have the calculator for the class because I didn't like the display and how equations were inserted into it. I like the ability to easily manipulate the equation to see how my answer will vary when I change a value. I have many other ideas to add, but for now I would like the calculator instead of all the extras.