CalcTastic Scientific Calculator is described as 'high-precision, feature-rich scientific calculator with years of refinement and thousands of satisfied users. Choose from 5 different themes, a configurable display and your choice of operation, Algebraic or RPN' and is a Calculator in the Education & Reference category. There are four alternatives to CalcTastic Scientific Calculator for a variety of platforms, including Android, iPad, iPhone, Mac and Online / Web-based. The best alternative is Google Calculator, which is free. Other great apps like CalcTastic Scientific Calculator are RealCalc Scientific Calculator (Freemium), PCalc (Paid) and Omega Calculator (Free).
Omega Calculator is an intuitive and powerful calculator that can be used for any mathematical computation you need to perform. I built this calculator to be different. It's beautiful, free, and has no ads: the VERY BEST calculator I have EVER used.