TI-83

If you (like I was) are looking for an app that NOT ONLY looks like a TI-83 AND has all the capabilities of one, this isnt it! And you know what? Youre not going to find it (at least legally). For that to occur, permission is required from Texas Instruments, and I frankly dont see them passing up selling you a $100 calculator for a $2 iPhone app.

The Fooled One about RK-83: Scientific Graphing Calculator, v1.2.4