# Calculator12 RPN — user reviews > 31 indexed App Store user reviews of Calculator12 RPN by Stone Meadow Development LLC, rated 4.43/5 from 7 ratings. - Source: https://appshunter.io/ios/app/calculator12-rpn/id286506398/reviews - App overview in markdown: https://appshunter.io/ios/app/calculator12-rpn/id286506398.md - Rating breakdown: 5★ 4 · 4★ 2 · 3★ 1 · 2★ 0 · 1★ 0 ## Newest reviews (10 of 31) ### 4/5 — Love the app — Please fix Landscape *2017-10-05, version 4.2.1* Great app, use it all the time. When are you going to fix the landscape mode. It appears to be wrong since the IOS11 update ### 4/5 — Hp12c *2012-03-11, version 3.4.0* This calculator is a horrible rip off ### 4/5 — Click *2012-01-28, version 3.4.0* Get rid of the annoying key click! ### 4/5 — Best so far *2008-09-11, version 0* Echoing comments made by others, I find this an incredibly useful tool, but there are some changes that I think would really enhance this tool's usability: * I wish it could be made to work in vertical as well as landscape orientation. I realize this would involve modifying the original HP-12c layout but I find it easier to hold and use the device this way. * I would like full bond functionality and agree that it's more important than programmability. * Clicks please. * Lighten up the screen or increase contrast; it's hard to read in certain light. If you have to dispense with the photorealistic look, that's OK with me. * You've really got to eliminate the very annoying startup screen. Thanks. ### 4/5 — Good app *2008-08-24, version 0* I love this app... Anyone who regularly computes TVM regularly and has an iPhone and HP12C, can now leave their trusty calculator behind occassionally and still be prepared with this emulator. Most of the negative reviews are from people who have no idea what a 12C is... Seems like a waste of time to write reviews on topics of ignorance. ### 4/5 — Very well done; can be tightened up *2008-08-22, version 0* Excellent port of my trusty 12C. I very much like your add of the register displays under the main display panel. Like some others, I am impressed how much extra speed you have been able to wring out of the old routines using the iPhone's much newer processor. I hereby offer a few suggestions for your update list: 1) Echoing others, key clicks are critical. 2) The yellow f and blue g key labels could be slightly dimmer in normal display mode, especially since you highlight them on pressing the function keys (a nice touch). This would be less distracting. 3) Similarly, the white key labels could be slightly dimmer, too (and/or the black background less dark). The contrast now between all labels and the keyboard background is so high that it will be tiring to look at for extended number crunching. 4) I know you are working from a photo of an actual 12C, but all the key labels and f and g labels could be crisper. Tighten them up with a pixel editor. No reason to be slavish to the past. 5) I would prefer the display panel numbers (results) to be slightly smaller, in favor of slightly larger register contents displays, but this is not a biggie. 6) I would find the original bond math functions useful. I would not miss the program functions at all. Some will disagree with me. 7) Would be nice to have the [f] prefix function, to temporarily display the panel number in floating precision, but no biggie, either. Well done, and heading toward a five star review with your updates. Am curious to see what new, soft functionality you decide to build in. Your calculator could end up putting my original out to pasture for good. ### 4/5 — Great App - Just Like the real thing! *2008-08-15, version 0* Purchased last week and got great support to a simple question. As a real estate analyst the availability of cash flow functions such as IRR, PV, FV and PMT in my I-Phone is reallly handy. Now I don't have to carry phone + calculator. Only thing it needs is a "click" sound at the push of a key. Also, the price is reasonable as compared to purchasing a second calculator in the cost range of $80 +. Great Job!! ### 4/5 — So close to awesome *2008-08-13, version 0* Please add clicks!!!! I am a bank vp and this is an awesome way to come closer to ditching all other tools... Clicks Please on an update sooner than later!!! ### 4/5 — The first, but incomplete *2008-08-07, version 0* There have been many HP-12C emulators for the Mac, some available from Apple's web site for years. Apparently HP doesn't or can't mind. Recall that this classic had its 25th anniversary a year or three ago. Perhaps HP is being nice or perhaps any design patent or copyright has expired, and you can't patent math. Other emulators for the Mac include Bond calculations and programmability, and even emulate the higher-capacity Platinum model, hence the deduction of one star for this first iPhone implementation. At least one major writer of these emulators, who has written for many HP models, tells me he is working on an iPhone version but it won't be ready until much later this year; hence if you like this calculator and use it a lot, it is perhaps worth the price. Be clear, though, that you are paying for the privilege of not carrying around your existing HP calculator, not for the functionality itself, since it is likely most buyers of this emulator already own one or more HP units. For sentimental reasons many who have relied on this calculator since HP first introduced it willl be willing to pay. If not, don't complain. Just don't buy it. Eventually competition will drive the price down. Early adopters usually pay a premium as early owners of the first iPhone know quite well. Remember that many complainers on the iPhone app store are really saying "I want it but can't afford it" That's their business not that of the rest of us. Perhaps Apple should limit reviews to actual purchasers. It's not hard so to do. ### 4/5 — Great to have the 12c, but... *2008-08-07, version 0* Great app, saves carying around the old trusty 12C. Needs to have the bond calculations implemented as that is an important feature for business/investment applications. ## Most critical reviews (10 lowest-rated) ### 1/5 — Upgrade?? *2009-05-22, version 0* Why is it that every other upgrade changes it's ability to do a simple loan or savings interest calculation. Please fix..... I think a financial calculator should at least be able to do that. Is there a way to go back to the pre update version that could actually calculate???? ### 1/5 — HP-12C *2008-12-03, version 0* Where is my 12C? This alleged "upgrade" I just downloaded and installed is crap!!! If I wanted a 12 E I would have purchaced it. Don't bait and switch on me. GIVE ME BACK MY 12C!!! ### 1/5 — Just terrible! Latest update doesn't even look like a 12c! *2008-10-26, version 0* I'm a long time HP user (I got an HP-15c when I was 10). This is just terrible. The first version was clunky. The latest version is just a joke, it doesn't even look like the screenshot you see in iTunes page. Just take a look at, for example, i41cx+... That is emulation, not this joke. ### 1/5 — Not worth the money *2008-09-25, version 0* Don't buy it. It's simply not worth the money. I waited for some improvement but the developer seems to reluctant to improve it. Thank god there is finally 12c Classic from RML software. Even the free version (12c Lite) is better than this one. The $9.99 version is almost perfect, with a brilliant portrait mode. My previous comments : Comments from a long time 12C fanatic : 1) key clicks is a must. 2) i would prefer classic 12C display fonts 3) graphics need refinement. keys should be more distinguishable. 4) too enpensive, the free app during pre 2.0 days was a much much better implementation of 12C 5) and please change the splash screen. a larger version of the icon would be much nicer. I am confident and hopefull that the developer will refine this app soon. ### 1/5 — Complete Ripoff *2008-09-23, version 0* Try the free 12C Lite (excellent implementation) or the amazing $7.99 i41CXp (super powerful - financial solver In PPC rom add on) instead. This program fails basic calcs miserably (i.e. Can't solve for Interest given PV, PMT, & FV). No excuse. Developer gouged on price for much needed functionality then failed to deliver! ### 1/5 — does not find interest rate *2008-09-21, version 0* some key functions show error messages. no support. it costs $20. I am ripped off my money. now I have to buy another. what is the point? this is the equivalent of stealing..... I think all positive reviews are fake. the calculator cannot perform simple operations such as find I when PV, FV and N are given. As well it does not find N. DISAPPOINTING. ### 3/5 — Numbers too small *2018-01-09, version 4.2.2* Please make the numbers larger. They are too small to be accurately touched. ### 3/5 — Nice Calculator, but no iPod Music! *2009-09-05, version 0* Sure, it's a nice calculator that does improves on the HP 12c, but it turns off the music when you use it. It's just a calculator, for cryin' out loud. ### 3/5 — Close, but could you a few tweaks *2009-06-23, version 0* Overall, works just like my HP12C but I wish start up was faster and inputs/assumptions included when results are emailed. ### 3/5 — Competent business calculator but very expensive. *2009-06-23, version 0* Calculator12 RPN is a competent business calculator but not as good as other HP-12C apps. It's very expensive for what it does and does not truly mimic a 12C. Stone Meadow has done a good job updating the application and fixing bugs. ## Most praised reviews (10 highest-rated) ### 5/5 — Works fine *2017-10-16, version 4.2.2* I have used this for years with no problems. When HP is selling (finally!) their own version, which is buggy and costs more, I can't understand why someone thinks this is a rip- off. UPDATE OCTOBER 2017: Nuts! When OS 11 came out, this app stopped working. I went to the developer’s website, and it appeared moribund. No activity, no indication at all that this was not just another orphan product. So, sadly, I laid down my $25. (!!) and got the HP version, which is fine, but stupid expensive. Now, out of nowhere, an update has appeared which seems to work fine with OS 11. Oh well. Buy this version, it saves you money and works well, at least as far as I can tell after a short time. ### 5/5 — Nice job! *2013-11-29, version 3.5.0* This is a very nice implemtation of our beloved 12c. I love all the extra functionality. It's a little hard for me to use though, because some of the keys aren't where I'm used to seeing them. On the iPad, I hate that the stock background flashes before switching to my chosen background. Is there any way to get rid of that? Great calculator though and I haven't noticed any other issues with it. ### 5/5 — The best! *2013-11-10, version 3.5.0* This is the best iPhone implementation of our favourite HP 12C calculator! Not only does it have all the features of the 12C, it also smartened it up with what a modern smartphone can offer with extra display info and conveniences. The pricing is also just right. Although I also have HP’s 15C port on my iPhone and use that for the various mundane calculations in a simplified portrait format, this one from Stone Meadow Development is my go-to for anything above that. No regret for the purchase from quite a while back and the support has been fantastic, now iOS7 updated. Can’t recommend enough! ### 5/5 — Better than the real thing *2012-10-02, version 3.4.0* Everything great. The only complaint I have is the enter button is below and right next to this new "undo" button. The new button is a great idea. but for someone who has used the 12c for years it is very easy to hit undo instead of enter if you are a little quick. ### 5/5 — A substantial improvement over the HP 12c *2009-07-18, version 0* The HP 12c is a standard - these folks kept the standard and improved it dramatically. HP simply recreated their calculator on an iPhone - didn't give any thought to improving it. In my mind, my "flagship" differentiator is the cash flow viewer/editor... if you've never tried it it's slick IMHO. It allows you to see your cash flow entries as a cash flow diagram, and edit them (including adding and deleting individual cash flows) using the visual format--with the HP you can only delete the last cash flow and to do so you have to change the value of the n-register and you can't add a cash flow in the middle of your series. If you messed up entering the cash flows, you have to start over from CFo. Emailing results, in particular amortization tables and calculations dealing with cash flows and one-tap access to the forum's FAQ page is very helpful - these guys did it right!! ### 5/5 — Awesome. *2009-06-27, version 0* I will be using this for my finance class this semester and it's cheaper than a real 12C! ### 5/5 — It Just Works *2009-04-17, version 0* I have been a long time user of the HP 12-c financial calculator. This application met and is now exceeding my expectations. The developer is regularly coming out with updates, making it better than the original. I have tested functions against my 12-c calculator and the application appears to give me the same results. Am very happy. ### 5/5 — Sound Implementation of HP 12C *2008-09-30, version 0* Highly reasonable version and worth the money IMHO. Thanks for getting rid of the splash screen and adding the clicks. Shows a commitment to improving the product. ### 5/5 — Just like the real thing *2008-09-14, version 0* One less device to carry. This is the next best thing to having my trusty 12C with me. If you don't need the bond or program features, this will serve you just fine. The visable financial registers are great, and the next version with visable stack and audible keypresses promises to be even better! ### 5/5 — This app is worth the price--no doubt about it *2008-08-07, version 0* OK. I've owned an h/p 12c since they first came out (and know how to use it) and frankly, this app is as good, and now there is one less thing to carry around. Other reviewers miss the point: the idea here is to replicate the user interface of the 12c, not create a cool new calculator, hence the "old fashioned" appearance. Sure, you can get a "financial" calculator for $10, but if you are used to the 12c, you want the same functionality, just in the iPhone. And please, stop all the whining about "these apps are too expensive!" If $20 cost is a problem, you probably don't need the application. Yes, it would be nice to have the R/S key and programability, but that didn't stop me from buying! --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*