There is nothing overly wrong with the calculator that is included with the iPhone. It is a pretty app that has all the functionality that you would really need to perform most math equations, but in the world of tap tap tap, it isn't perfect. There is no history screen, no way to see what you've typed in a long equation, and scientific features that can only be accessed in landscape mode. Being the perfectionists that they are, tap tap tap knew that the world needed a better calculator.
"Calcbot is a simple, yet intelligent calculator for your iPhone, iPod touch and iPad (Universal). Never lose your place in a calculation again with the live as-you-type expression view. Simply swipe the keypad to the left to reveal advanced functions. See your past calculations in the history tape. You can even send old values and expressions back to your calculator or to a friend via email. Calcbot is the smartest, simple calculator you will ever use."
Being only a novice calculator user (but a long time TI-83 gamer), I had no insane algorithms to throw at the app, but was immediately impressed by the slick UI. As you type, the parts of your equation show up live, right under the solution, preventing the inevitable forgotten variable. The simple swipe commands for bringing up the scientific calculator and the history were also welcome additions.
I have to admit, when I woke up this morning I thought I had a good calculator built into my iPhone. Now I have a better one. Thanks Tapbots and tap tap tap!
Be sure to check out the extra screen shots after the break.