The calculation in nowadays is not only linked with counting the stuff and simply multiplying or dividing them. The level of the stuff that needs to be solved via different logical calculations is increasing day by day. An individual despite possessing remarkable abilities is not that much competent that he or she can do such calculations in real time without any guidance or direction. Even the middle and high school students do not require the standard arthematic operation based calculator as their level is upgraded too and they will never go for the less than the scientific calculator, that allow them to do a lot more different kinds of calculations and operations. In the fields of programming, statistics, finance, engineering, etc. the people need to perform varies in depth and complex calculations based on totally different concepts. In the near past, the high ended calculators were quite expensive that are used by scientists and engineers for their work. No everyone can afford them still as they are not provided to everyone. All of the leading technology work needs to be done with more ease and convenience rather than making the things more difficult and complex. For this purpose, there is a gigantic variety of top notch calculator apps on the iOS that the users can use for performing all their desired functions and operations with initiative interfaces. Best of such apps are listed down below.