I was searching for a simple calculator like the one on iPhone, but one that logs calculations. This is almost the perfect replacement but can use some tweaks. I would like to see the calculator clear automatically instead of having to manually clear out between calculations. Also, I found when attempting to use the previous result in a new calculation, the calculation actually combines with the previous resulting in an unintended answer. The final critique I have is for the log to be in reverse order with the last calculation appearing at the top and each prior calculation appearing thereafter. Otherwise, great job! I even love the color scheme!