allRPNCalc Calculator App Reviews

I really love this application. Especially now that it has a amortization table. It is just like using my trusty HP 12C only it is a lot better because it can do so much more. The price is fair and I am very happy with this application. If you are looking for an RPN caluclator you will not go wrong with this app!

Best calculator in the app store.

If you grew up using HP RPN calculators, this is the calculator for you. Its exactly what youd expect. And more. But even more important. I ran into a snag, emailed the developer, and had a response *in minutes*!! Was up and running minutes after that. For a $6 product, thats amazing. Im such a fan, its hard to put into words.

After searching for and downloading/paying for several RPN calculators, and as a previous user of the HP-48sx back in engineering college and the HP-32SII back in medical residency, allRPNcalc (version 2) is the first RPN calculator that deserves a spot on the front page of my iPhone as a worthy replacement of the functionality and feel of my still-functioning HP calculators. The overall design/layout/colors are well-planned, efficient, and basically beautiful - I keep turning on my iPhone just to look at allRPNcalc, which is an impressive demo app when showing off the features of the iPhone. Finally - an RPN calc with TWO levels of the (four-level) stack displayed! Why dont more RPN calcs do this? I would prefer seeing all 4 levels, but 2 is significantly better than 1. Plus you could always use the roll "R" button or press the information "i" button to see a full list of the stack and registers. And finally - a large "Enter" button! It seems the developers took all of the basic functionality of the old HP RPN calculators, but instead of simply duplicating appearance and multiple shift keystrokes and limited displays (as many other RPN apps do), they smartly modernized it to the iPhone platform.     Additional features include display of the last operation in the upper right of the screen, easy change of the display output mode (including fractions) using the top green buttons, a triangle solver, built in help that lists the functions of all the keys, and unit conversions (including currencies) with an interesting scroll-wheel interface. The information "i" button is in an odd location, but makes more sense when you realize that the bottom 5 rows of grayish buttons are fixed. The top three rows of brown buttons change their function depending on the "mode", selected by the row of green buttons. I do not use the financial features enough to make any comment on those available functions.     Although I agree with many suggestions of the reviewers below, I am giving allRPNcalc 5 stars for design and functionality. Suggestions: A reviewer below suggested an "undo" function ("last x" can be helpful but wont preserve y) - how about implementing undo by swiping finger across the number display? As a possible solution for displaying all four levels of the stack, how about pressing and holding the number display will trigger a small window that pops up (same red on black, small font like the stack/registers list) quickly showing t,z,y,x, and then disappears when your finger lets go.

I have tried a bunch of the RPN calculators and this is the easiest to use and most comprehensive of them. This is the one you will end up using most of the time, so save time and start with this one.

I consider the program of the MOST valuable ones on my iPhone...and wouldnt leave home without it. My wife doesnt understand why I need RPN for routine math, not to mention financial calculations, trig functions and statistics...but I do! When a recent "update" glitch, now resolved, left me without the program for several weeks, I realized how much I missed it, as I found myself trying to open it several times a day. Ultimately, getting it again operative, once I found the instructions on the developers website, proved ridiculously quick and easy. A particularly nice feature for the Financial section is its nearly automatic generation of a full amortization or depreciation schedule. The one feature I would like to see in the next version would be operation in both the current vertical but also, the horizontal mode, the latter the way one uses the fabled HP11C and HP12C, which I have in the hardwired versions, but which I no longer carry, as allRPNCalc makes them superfluous, rather like a DC-3 in an Airbus 380 era.

I tried a few rpn apps and this one (the last) is it, has a practical layout and is easy to toggle between modes. Also the "look" is great, similar to Apples built in calc (keys) - a personal preference. Great job!!

Although I have a different preference in the placement of the keys (I prefer an HP41 layout with the operand keys to the left of the numeric keys) and there is no programmability to this calculator, for what it can do and for the relative ease of being able to do it, I give this app five stars.

This calculator is a real buy at this price. I love all the choices and the ability to get foreign currency quotes. I used to use RPN notation and then lost my HP calculator. This machine is really slick. I couldnt live without it.

This is the BEST CALCULATOR APP EVER! I recently heard from developer that this is a niche product and was so disappointed that people dont understand the gem that is here. I have personally owned HP-12c, HP-48gx, HP-35, HP-17BII, HP41CX, TI-84plus, and TI-30 calculators and this one is vastly better than all of them. It has excellent functionality in SCI, FIN, STAT, PROG and General MATH areas, is super easy to use (well organized keyboard that is not crowded), has great output, and a few hidden benefits like conversions, curve fitting (super easy), etc. This app is only for those who know how to use RPN (includes all of you HP-12C users), or who care to learn how to use it, as opposed to the more difficult Algebraic logic found on most calculators. If you understand order of operations and find nested parentheses tedious than you should be using RPN, if you are not already. Historically, Hewlett Packard developed high end professional engineering and financial calculators with RPN logic while Texas Instruments developed low end student calculators with Algebraic logic. In retrospect, TI stole the show by getting to the students first; a peverse outcome given the superiority of RPN. HP screwed up and we all lost in the process. To be fair, Algebraic logic calculators have markedly improved in recent years, but RPN is so much better for day to day and this calculators implementation is sensational. This is your chance to right a historical wrong. Support RPNby using the finest example of its capabilities, allRPN Calc, and in the process you will be supporting a superior app developer (returned my email regarding a problem with this great product virtually within minutes) in a sea of mediocrity. The cream should rise to the top, but only if we as users share our finest discoveries. Since I am so enamored with this app, I offer one final plug. If you are using ANY other RPN calculator on your iPhone or as a stand alone, you will be so very happy after you try this app out. It is the consumate bargain.

I cut my calculator teeth on an HP-34c, upgraded at one point to an HP-32sII, and bought an HP-48g days before they were discontinued. Though the allRPNCalc cannot graph (that would be an awesome update, if developed) nor offer stepwise programming, it has plenty of numerical oomph to satisfy most calculation problems, including those of binary, octal, and hexadecimal. iPad users note: this is an iPhone/iPodTouch oriented app that must be viewed in portrait mode to operate.

I am a finance student who currently works in a bank. I am constantly calculating various financial figures. In college, I used the TI 32 financial and a HP 30B business pro. This calculator is WAY better than either of them! It has a graphing feature, as well as amortization tables...not to mention it has 4 other forms of calculators to toggle between. Buying a new HP 30b costs about $60! this app IS TOTALLY WORTH THE PRICE (especially compared to the name-brand fin. calc apps)!

I love this APP!!! Best on the market. I go to use it this morning and it says I have demo version and to buy a legal copy......I bought a legal copy ORIGINALY and have been using it for at least 2 years....I even tried to buy another copy but the App Stores shows it as already purchased and wont let me...Im stuck............HELP