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Shift Calc is a calculator which has big buttons, and a shift button to switch to the second screen to input operation buttons.Because of the big buttons, it's very easy to input numbers, even though you need to push a little more button.Especially, if you put your iPhone on the desk and use it as a calculator, then you would soon realize that you could put only 3 fingers on the screen of your iPhone.That's why Shift Calc has only 3 big buttons on the horizontal dimension. It's very comfortable to push buttons without paying too much attentions.You can also review the history of input and calculation.I use it everyday for my job as an accountant. Now, it's your time.SUMMARY OF GOOD POINTS* Switch screen by Shift button* Big buttons are comfortable* Can use either on the desk or on hand* Calculation history review function* Memory buttons