The Best Calculator - Calc Pro

Even in the standard mode you can see your prior calculations by pressing a pen icon at the top right area of the calculator. The scientific calculator does logs and other standard functions. I use the unit converter all the time because I don’t remember the conversion factors. This was a fantastic purchase.

One of their calculator is a statistics Calc, and a sorry one it is at that. It has a small list of linear regression functions, some permutation and combination calculations but not even a standard deviation function. Forget about X2 function either or z values and probabilities, average, correlation, or even median. To call this a stats Calc is just wrong. I would rate it zero star if I could. Somehow they think inverse tangent, cosine, etc is part of the basic stats tools. Wish I could get my money back. Maybe they omitted a screenshot of their statistical calculator on their App Store description for a reason…

This is really a great calc, but with a major flaw when in RPN mode. I reported the flaw repeatedly, with no fix and no acknowledgement of my reports, despite their promise in the help screen that they would ack bug reports and feedback. The flaw happens when the calc is in RPN mode, emulating a real HP RPN calc. It's about the key LastX. I am not going to explain how LastX should work - you either know it, or you don't, and if you don't, it doesn't matter; it means you are not in the RPN mindset. In this calc, LastX does NOTHING - it's totally, absolutely USELESS. I would have given it five stars, but because of their stubborness in handling - actually, not handling - customer's feedback and bug reports, I punish them with one star.