Wiser Calc is a handy scientific calculator which provides an intuitive user interface suitable for simple and complex calculations. This calculator supports "natural display" input style and many other great features such as browsing/editing calculation history, saving/loading/emailing worksheets, simple swipe gestures, variables, and more.

Link to iTunes: Wiser Calc ($0.99)

YouTube video:[ame="http://www.youtube.com/watch?v=rMZ1WJhkhYE"]Watch demo video[/ame]

I got some promo codes if you want to try it. Also, your feedbacks would be greatly appreciated.

Thanks!