RPN-45 HD App Reviews

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Well Done. This very realistic simulation of the HP-45 has everything one could ask for in a classic HP calculator simulation. Absolute photo-realism, from the buttons (that actually appear to move and make a nice clicking sound -- a switchable option), to the dead-ringer display, not to mention the on-off switch that uses a swipe to move the switch. Going far beyond the power of the actual machine, this simulation provides many more functions and capabilities for virtually any computational need. Nice touches, like displaying the value of Lastx, the stack, and the trig mode complete the package. Another plus: When this reviewer made a suggestion for one area of potential improvement, the developer was very responsive and is including the improvement in a future update. You won't find a better HP-45 simulator than RPN-45 HD.

Bogus update. App crashes upon launch ....

Big Oops. Crashes on startup, tho I think mine may have lasted 3seconds. Hiring MS coders?

Update problems. The app crashes after 5 seconds or so. The update ruined it!!!!!

So much to love with this app !. This app is a great emulator of the classic HP-45 Scientific Calculator, in look, feel and function. It keeps getting better and better with each update. It offers full complex number functionality, even surpassing that of the HP-15 in complex mode. It comes with many powerful functions, which are actually sophisticated programs, including: 1. Linear Equations -- this lets you solve simulatneous equations for X & Y and in complex mode can solve for the real and imaginary parts for X & Y. 2. Quadratic Equation Solver -- solves entirely within the stack. 3. Cubic Equation Solver -- solves entirely within the stack. 4. The Factorial (n!) also doubles as a gamma function. By subtracting 1 from X and pressing n! you can get the gamma function of any positive or negative number and not just integers. 5. It offers full Linear Regression & Linear Estimate and many other statistical functions. 6. Full calendar, clock and timer functions. An alternate view shows full contents of stack, last-X and all 18 numbered registers, and in complex mode you can see both the real and imaginary parts of all stack & last-x registers. While the original HP-45 had 10 digit accuracy, this app has much greater accuracy as it carries far more digits in its internal calculations. This app is a companion to RPN-45 SD (for iPhone). I have both and highly recommend buying BOTH versions so you get the extra benefits of the iPad version and the portability of the small device version. Truly elegant design. I love the quality of cuveesoft's calculators!

New Feature!. Crashes on launch. Worked great before.

Excellent Simulation. Calculator works great just like my original HP-45. Worth the price and brings back memories of using the slide rule before getting my HP-45.

Beautiful Emulation. I have owned one of these since they first came out, and still have it on my desk at home. Having one in my iPad is like traveling with an old friend. This app emulates the old machine perfectly, and even offers some useful additions.

RPN-45 HD. good app before the update. As with previous reviewer, it crashes after 2 seconds on my iPad2

My go-to calculator. I have no idea where all the one star reviews are coming from (perhaps the initial release?). If you have fond memories, as I do, of using Hewlett Packard scientific calculators back in the seventies and eighties, you owe it to yourself to check this app out. It isn't a programming heavyweight like some of the other vastly more expensive simulations, but it offers a straightforward presentation that makes you feel like you have your old trusty HP-45 back on your desk, but one that's been enhanced too. Five stars for presentation, functionality, and continuous improvement.

Fantastically faithful hp-45. This app is beautifully executed in every way, my sincerest compliments to the authors. I owned the hp-35, 45 and 65 and it's great to have one of them "back" again. My only request: save state between program executions.

Highly Recommended!. I love this app. I bought a HP 45 while in college. If I am not mistaken, it costed more than $350. I am of the generation that learned both slide rule and calculator. I would not be able to graduate without my HP 45. I still have it stored somewhere in a box. I am so used to RPN calculators that I have to think when I use a normal calculator. I recently got an iPad Air 4 and was looking for a calculator app. So happy to find this one. I am amazed that I still remember how to work this. Considering that I have long retired and have not use a scientific calculator for many years. A financial calculator would probably be more useful but then it would not put a BIG smile on my face when I am using this HP 45 app.

It just gets better. I thought this was great before. I had only three suggestions and they've all been implemented. Great job.

Hp 45 Update. App now crashes upon start up... Hopefully there's a fix on the way otherwise the app is useless!

Exactly what I was looking for!. Having owned the HP-45 since college, I have been using my original for over 37 years, but with batteries hard to find, I wanted something to use when not at my desk. Since I now carry an I pad with me everywhere, this ap solves that problem! Would like to see landscape mode with the registers shown on the side. Great ap that I would recommend to anyone who grew up with an HP-45!

Works great!!!. Key pad works much better now. Look forward to exploring the new functions. Thanks!

Crashes after the last update. Application unusable. It crashes immediately after launch. If current version works, don't upgrade.

Beautiful. A great simulation of the HP-45. Beautifully made, with a lot of attention to small details.

Nice update. ENG is a good addition. Some suggestions for the future: Swiping the calc could show the guide on the back of the real calculator. Show views of the innards somewhere in the Help. Support financial calculations (n, i, pv, pmt, fv). The tricky part will be selecting which keys to use. Show more constants and conversions.

Great. This is just as I remember it. love that RPN and simple keys that can do so much.

delta dates using a register recall.. the recall of a stored number is trunked I stored 12.312017 in register 9. when I recalled it it came back as 12.3120 the recall trunked the last two digits. ignore this entry user error.

Great simulation of a classic hp rpn calculator. I have been using this app for several years. I still have one of the original HP 45 calculators. Has it really been 45 years? This App is my go to calculator. Highly recommended.

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