RPN Calculator 48 App Reviews

Have used HP calculators for engineering my whole career. Have owned a few HP48 family calculators. It is so great to always have one with me n my phone wherever I need it. One of the most useful apps!

RPN at it's best‼️

As a user of an HP 11C for 45 years, this app works well for my needs, so I rarely carry the old 11C out of my office 😄

I began using the HP48 in engineering courses and always felt that it gave me a huge advantage. So 30 years later I have this wonderful app that provides a powerful tool that I’m familiar with and I use it multiple times a day. Very happy with it!

You can’t find a better calculator anywhere. Once you learn Reverse Polish Notation (RPN), an easy proposition, you cannot use any other. You will find even the most difficult computation very easy to resolve.

I can no longer afford using any else calculator than an RPN one, especially this HP48 simulated RPN Scientific Calculator. many happy returns to the developper.

I use this calc daily. It’s well-designed and as straightforward to use as my hardware HP.

My go to calculator.

I used both of the HP SX and GX calculators back in college and loved them. I love having a calculator app that uses RPN and has a stack. The app works great and if you like a RPN calculator, I highly recommend this app.

Having gotten used to RPN, I love that this app provides me the basic operations needed for my daily calculations. RPN is a definite logical method and this app provides 👍

Excellent, simple call back to the HP 48 for people who like to do arithmetic RPN style.

Very easy to use, super fast clean interface, good layout, no ads. I love the simplicity and speed, I tried multiple other RPN calculators from the App Store and this one was the best, I have been using it for years and I love it, it just works.

Good for quick calculations. Wish it had scrolling stack but otherwise nice.

Suits my needs perfectly. RPN is versatile and your implementation is superb.

I’ve tried several free versions. I read the reviews and figured this one was worth the $4 risk. No jankyness / bad UI. Mimics my old 48GX pretty well (minus the graphing features). Everything works as expected! I don’t mind paying for software, especially if it motivates the developer to continue porting the app to each iOS release— (historically, a lot of my freeware apps have lost modern iOS support whenever Apple deprecates an old feature.)

I’m an old school RPN engineer. This is a great tool!!

I only miss the SWAP button from the original HP calculators. Please consider adding it to a future version

Can’t live without it!

Perfect for my use in the field. Convenient

I just love this — best calculator ever.

This app has everything. Could you please add haptic keyboard feedback? I turned off the sound as I want the calculator to be silent. Haptic feedback would be great to know when I have pressed a key.

Finally! A calc app that replaces my old m48 app that was removed from the store. This has nice big responsive buttons and large 10 level stack with exactly the right amount of functions used most often.

Have a number of the 41 series and they have all finally died. This has been a good replacement although i haven’t explored it’s programmability.

This full feature scientific calculator is my go to calculator for everything. I love the RPN style of entry, science the classic HP 45 and 65 calculators I loved so much. It also has hexadecimal and octal modes that I used while working, not so much now that I am retired. Easy to use. Love the display.

This app is far superior to the default iOS calculator app - mostly because it’s RPN. It does everything I need a smartphone calculator to do, and I don’t have to change the way I think about using a calculator. It works reliably and smoothly. It’s been the calculator app of choice on each of my last four iPhones!

Please keep updating it. This is a perfect calculator!

I’ve tried several free versions. I read the reviews and figured this one was worth the $4 risk. No jankyness / bad UI. Mimics my old 48GX pretty well (minus the graphing features). Everything works as expected! I don’t mind paying for software, especially if it motivates the developer to continue porting the app to each iOS release— (historically, a lot of my freeware apps have lost modern iOS support whenever Apple deprecates an old feature.)

Learned rpn on a 41cx so long ago. This app sits intuitively on an iPhone screen and is easily one of my favorite and most useful tools.

I am a retired engineer who likes my HP 48G that no longer works. RPN is my natural habitat and I usually have my iPhone with me.