Well, I bought the nice physical calculators because I needed the functionality that they provided over the cheapo calculators. The difference in hardware (pro

Well, I bought the nice physical calculators because I needed the functionality that they provided over the cheapo calculators. The difference in hardware (processing and screen) between e.g. a solar-polared four-function calculator and a TI-89 are representative of a difference in potential functionality and manifest with a difference in price (driven by real-world production costs). However, one app doesn't have any less resources than another and/or doesn't have any hardware differences that would e.g. add cost if you want to visualize a graph versus compute a number -- outside of the software costs. I guess I just assume all apps are a race to the bottom here, then, because I find it mind-boggling that there aren't free apps with functionality that mimics any and all paid apps (especially in a calculator app specifically, where the dev-work is generally just _making it_ rather than inventing something new). That all is to say: thanks -- I guess it's just a difference in features and quality comparing paid apps to free apps here. I don't really understand how that is the case (why don't people continually make cheaper/free calculators of equal quality?), but at least I understand the how. :)