RPN calculator

Best calculator app ever. It's simple easy quick and clean. The only rpn calculator I could find that holds more then 3 numbers in the stack. The addition of some trig functions would be nice, but I understand how that could compromise the simplicity of this incredible app.

Great app. I love the RPN method of entering numbers. I also love the how the app saves and shows the history of the previous numbers (or in another term the "stack")

Does not work with Samsung DEX. Cannot see the entire calculator and cannot interact with it.

This a straight forward RPN for addition, subtracting, multiplying and dividing. Big buttons and decent display. I like the simplicity.

Great app EXCEPT WHY DOES IT HAVE TO TAKE UP THE WHOLE SCREEN? It's like yelling at me. Also I like to use it while I am using another app that I have open. Please fix it so it can be sized by the user. Even if it only has about three sizes to choose from it would be a100% improvement. Then it would get 5 stars from me. Am I missing something?

My essential calculator app. Those of us who know RPN use it because it's the easiest method to do calculations. This is a simple and straight forward basic RPN calculator app. Thanks go to the developer for freeing us from Algebraic notation.

Minimalistic, nice design. Be nice if it had EEX button... and Rotate would be nice too. (Frankly, you could get rid of the square root and replace it with EEX or %... as sqrt is simply [.][5][x^n] or [2][1/x][x^n]... cube root is [3][1/x][x^n]... And, of course, any root can be done this way.)

Good app for basic rpn calculations. But you can't even enter a negative number, or do basic trigonometry functions.

nice big numbers. no reset, no scroll. starting to have problems with response time.

This is a very good RPN calculator. If that's what you're after, then this would be a great choice.

can not use keyboard on Chromebook

I ha ve used this for years and it always did everything I needed.

not a widget.

No frills solid no-ad useful RPN calc.

The only calculator for me.

Installed it, loved it. Read on your web site about why RPN and why a simple calculator and I can just say "me too!". I used to have an HP48 emulator installed, which I loved until I hit the wrong (small) key, or the emulator itself hung (specially when this happened in front of a non-initiated friend who wondered what the hell I was doing with such a calculator). If only you could add two things to aim for "6 stars". I wish I could navigate up/down the stack, not just swap/drop (Maybe just tapping a line on the stack could copy it to the bottom). And I'm also not crazy about the icon; I think it does not fit well with the dark, simple style of the app. But then again, taste is subjective.

Have used RPN for 40 years. Have looked at many Android RPN calcs and settled on this one primarily because of the great stack/history view. Would give you five stars if it had a Roll button to scroll the stack. Would also like slightly larger/bolder font on the buttons. Not updated since 2013, really? Too bad.

This is the most elegant and easy to use calculator I've found. That's saying something since I was 22 years at HP and still have half a dozen HP calculators in a drawer. The "SET DP" was not obvious but hey, what's my brain for? If it would ever rotate when I change orientation on my tablet it'd be perfect, but it does not.

Perhaps my only suggestion is to change the audio feedback to a soft click which can optionally be turned off (like how Free42 sounds).

I am so thankful this app exists. There are too few people left in the world who appreciate the elegance and efficiency of rpn! This app creates a possibility to keep it alive.

"No frills" might sound like a criticism, but it's not. If all you want is a simple, easy to use RPN calculator with basic features and an uncluttered interface then this is the app for you. I love it.

I love the design! Very simple calculator almost perfect at what it does. Only thing: PLEASE move the enter button to the right side.

I used fancy HP rpn scientific calculators in school and work back in the day, and find RPN very intuitive. These days I only ever do basic arithmetic and this is the perfect simple rpn calculator for that.

Solid basic calculator. No permissions requires. One 4 stars + 1 star bonus for price.

I like it, simple and does what I want without excess or silliness.

The square root button is not needed (it's just a matter of using 1/x and x^n)...you could replace with "%" which is really the only missing function! Please set the color to be theme independent or give us an option to choose. Great app! Thanks!

This is high quality! If you're looking for an rpn calculator this is the best choice!

I have loaded this on every phone I have ever had.

This is just such a nice straightforward simple everyday calculator!

Love it! Just what I needed for a quick Calc.