allRPNCalc Calculator App Reviews

I hope in an update the developer will add statistical funktions like median, modus, absolute and relative frequency, quartils and quantils... that would be great and worth seven stars. now its six :-)

The calculator has all scientifical functions and much more, e.g. conversion of units. It really deserves 5 stars. There is only on little thing you may have got accustomed to: you have to switch to trig functions before you can enter pi (3.14...). But if you know this, it is no problem any more.

(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 programmers functions will merit a perfect 5 stars, but really: for a first release this is superb.

Awesome application. I like the functionality even better than my trusty HP - particularly the conversions.

I think this is very good app. May I ask how you can get this for free? #4

Easy to use. I like the built-in conversions and the triangle solver is a nice touch, though it makes it so easy it feels like cheating :) One minor issue that I hope is isolated is that in RAD mode, tan(pi) returns -1.22e-16 instead of 0. Would like to be able to create custom units. Still hoping for a replacement for my TI-89 (CAS, 3D graphing, Symbolic Calculus, programming, etc.). This isnt it, but I replaced several free calculators with this one and freed some home screen space. Considering the TI89 is around $150, I would expect to pay more than $5 for something with similar functionality. Something that reads TI Basic would be great so I dont have to re-write my programs.

The financial functions are modeled after legendary HP 12c. Plus it has scientific and math modes. 12c emulators (that I also have :-) are $10-$20. Here you get them + much more and cheaper. Great, great product!

Version 2 fixes the error of not providing the financial functions, but adds others. The key that is supposed to switch between modes of SCI, FRAC, ENG, and FIX is set to OCT and does not change regardless of function. Additionally, the math mode in FRAC mode worked great when working mathematics/engineering functions that required the use of fractions, but the math functioning does not work with the OCT mode. Hopefully the software engineer fixes this as quickly as the last patch.

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 dBs, so 10*log10(x) and 10^(x/10) would have been my choice there. Thanks for a great app.

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.

It constantly crashed the first 10 times I used it but the problem seemed to go away now. This is one of the best 5 buck programs Ive bought for the iPhone. Keep up the great work. Would love to have cooler icon to display. Id also recommend to make the Help page a bit more detailed for first time users.

I downloaded and even paid for several other RPN Calculator apps before finding allRPNCalc. This has all the functions that I use regularly as a surveyor and engineer combined with the best interface. Excellent job Ernest!

If youre looking for a feature-rich RPN calculator, you will not do better than this one at any price. It rolls up the features of multiple calculators out there with price tags EACH double allRPNCalc. Im particularly impressed with the display editing features - fixed, scientific and engineering floating, fraction - all with accuracy and precision that cant be beat. Besides the usual math and trig functions, there are financial calculations (the equal of my trusty HP 12C), statistics, programmers functions, unit conversions - this one has them all at a very reasonable price. Visually, its a beauty with a clean interface and thoughtful features like stack display and clear stack key, to name a couple.

I purchase a lot of apps, but havent yet commented on any - this is one that I really must. I like this calculator a lot. I like the fact that its RPN. Im a software developer so the programmers keyboard comes in handy. Whats really special about this calculator is that the developer didnt just give minimum functionality to the various keyboards, but really put in the extra effort to make each one fully functional. I use the trig and financial keyboards a lot as well as the conversion and regular math. It seems like the only one I havent used yet is the stat, but that too is one Ill be needing. Im glad that it has a mode to view all the registers and their values easily. The developer did a really nice job on this one. I recommend it! Kudos to Ernest Brock!

It is definitely worth $5! Now I can finally do my scientific calculations on the iPhone.

I bought this app because I have been looking for an app that is similar to the HP 17b. Man was I wrong. I have messed with this app for an hour and can not get the financial calculator portion of this app to match my HP 17b. Does anyone know where to find a user friendly app that has true financial calculator capability? Everything I find simple calculates a loan payment or the calculations are wrong.

This is the best financial calculator; Im done shopping; any chance a "Clear All" button can be added?

Very nice rpn calculator just wish the stacks worked like hp 48 gx

Wish the stack worked like the 48 with drop and roll functions and dont like the double entry...its old style. Not very customizable, but good layouts. The shrunken stack is annoying and the color scheme is hard to read. Why do functions go on top of the stack? Again annnoying. Still...its pretty good despite these things. There really isnt anything that simulates the 48 well. This is my 6th rpn download and all dissapoint.

I bought 3 popular and well rated RPN calculator apps 6 months ago and this one is - BY FAR - my choice over the others AND above the HP48GX handheld I used for years. It is an incredible bargan at $5.99. By way of background; I am a Mechanical PE for 20 years, and I know how to put it through its paces. How would I improve it? Add a paper-tape feature. Otherwise - you nailed it! Fantastic work!