Superb In Every Way!
I missed having an HP 12C emulator on the iPhone (had one on my Palm). Some how I missed this calculator when looking in the App Store and instead purchased one of the other 12 C emulators. It was ok, but the keys were small, it was slow loading and there was a delay in pressing the key and seeing the response. Then while browsing the App Store one day I found AllRPNCalc for a much cheaper price. It is the best calculator app for the iPhone in my opinion - the keys are large and clear, the display is wonderful. I love the red and green coding used in the display. The key click sound is not annoying as it is on some of the other calculators. Unlike other iPhone calculators this one is fast and accurate. Plus, besides getting a financial calculator that is true to my old 12C, it includes features from other HP RPN calculators from the past. Buy this calculator, you will be very happy. It is reasonably priced, takes up very little memory and the developer has proven to be very fast at fixing bugs.
Show less
EXCELLENT calculator, constructive feedback below
I was looking for an HP32 equivalent, but found that allRPNCalc was better than the real HP calc (except no programmability). The keys are good size, the response is fast, trig accuracy seems good (tan(pi)), register display is nice extra not found on real calc, and on-line update of currency conversion rates are unique to networked calculator. However, some of the currency conversions are inverted wrt arrow keys, e.g. Japanese Yen or Swiss Franc to US dollar. Some of the common conversion rates used for news are opposites, and maybe the online feature used here is not taking that into account. Please fix this. Also, dedicated x^3 and cube-root-x is not necessary given y^x and xth-root-y. 2 limited programmable keys would have been nice. I always use dB's, so 10*log10(x) and 10^(x/10) would have been my choice there. Thanks for a great app.
Show less
Very very good Calculator
(14-Sep-08) If you prefer the RPN entry method you will like this calculator. The keyboard layout makes sense and the functions are well organized into separate menus. Switching display modes is simple, for example, to select "4 decimal places fixed" simply press the display mode indicator at the upper left until it reads "Fix" and then press "4." You can view the contents of all registers (except the triangle solver) via the help menu icon. Key clicks can be turned on or off for quiet locations. The unit converter is intuitive, making good use of the iPhone/iTouch UI methods. And... the factorial (gamma) function operates correctly, with "-0.5 n!" giving the proper result... many calculators get it wrong or throw an error.
This app gets nearly everything right. Some minor cleanup of the look (move the help button to top center and extend the static number & four-function keys) and a 64-bit capability in the programmer's functions will merit a perfect 5 stars, but really: for a first release this is superb.
Show less
