RPN 30 User Reviews

Ashok Khanna

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Simple, uncluttered, responsive

Really nice simple RPN calculator app with a clean and uncluttered interface with decent sized buttons that nevertheless still has all the common functions I need on a handheld calculator. Responds instantly with no perceptible lag even on a fairly old phone. A few things in the UI are a little unintuitive at first (e.g. the location of the backspace, undo, and swap x<->y functions, and it took me an embarrassing length of time to figure out that you close the help page by swiping down), but it works well once you learn how to use it.

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Alex P. Holden

2 years ago

Response from developer

Many thanks for the kind words. I agree that some of the UI is a bit hard to follow at first glance, sorry about that. Hopefully you will enjoy it for the years to come and that upfront time investment pays off :-) Thanks again

Engineering gem

I have been using hp calculators with rpn notation since the 80s.
With the addition of the rectangular to polar and polar to rectangular conversion feature added to this app. I really have no need for an actual physical calculator any more.
Thanks a bunch

UHouston

2 years ago

Frustrating

This is a great simple (and robust) rpn calculator. The navigation is smart, but not very intuitive. Needs more extensive, or easier to find, instructions.

dsearlephoto

2 years ago

Response from developer

Sorry for your frustration. Press down on the decimal button “.” and then use your finger to drag the settings bar for number of decimals to the left or right. Let me know if any issues

Very nice

I first used RPN years ago on an HP calculator in college. For the last five years off and on I’ve looked for an RPN iPhone calculator that was easy and quick to use, one that takes advantage of the iPhone touch environment, rather than one that tries to emulate physical buttons. This calculator seems to do that.

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scalwatx

3 years ago

Absolute gem!

I was just introduced to RPN, but unfortunately I couldn’t find any modern calculators with it. The old calculators that have it are now “vintage” and incredibly pricey, so I started looking for apps - and I’m glad I did, because this calculator is an absolute gem! It is elegant and clutter free. I have replaced using my iPhone calculator with this one. I love the fact that it has no ads. I would definitely pay for this. Thanks and keep up the good work! :)

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The great squisher

3 years ago

Very nice

What a relief to find a quality RPN calculator that works well across all my devices. Be sure to long press the Help button to read the instructions. This is now my daily default calculator when I don't have my 12C around...

Mountainbound%

3 years ago

Response from developer

Not having my HP12C was the reason for making this calculator :) Thanks for the kind words and have a nice day

Looks good but… Deleted

I’ve used RPN calculators for about 50 years, and while this one looks good on the surface I find the numbers being laid out in three distinct areas to be very confusing.
RPN is all about a simple way to enter, manage and calculate numbers using a STACK. Three incongruent numeric display areas goes NOT a stack make. And where are simple things like Swap or Roll?
PCalc Lite is a much better RPN calculator because it gets the Stack right.

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Talasoft Guy

3 years ago

Response from developer

Thanks for your feedback, that is valuable information. SWAP can be achieved by tapping the Y register in the top left of the screen and I will look into DROP further. I get your viewpoint on the stack alignments, that’s just going to be a point of difference and I am glad you have found an App that works for you. My rational has been to treat the stack as a second class citizen where I use / forsee others to use the calculator with minimal stack manipulation (two reasons - 1. Do it right the first time and not worry about reviewing / editing the stack and more importantly 2. For any more complex calculations that require stack manipulation, I envisioned it would be better to use MS Excel or a computer). Hence, my choice of display is to maximise the display size for the x register and make it more convenient with the y register + showing last expression. Not to say I disagree with you, I completely understand your viewpoint, I guess mine is not as classical conformance to the notion of RPN calculators, as you alluded to in your review. Thanks very much for your feedback and different perspective, I will ponder over it more. Thanks

Does the trick

Nice and simple. No adds.

ultraviolet carastrophe

3 years ago

Response from developer

Thanks!

Close but not what I’m looking for

Simple layout which is ok but the DIV button is off putting to me. I ended up going for “RPN Calculator” which is a little better for my tastes. I’m switching from Android using “RealCalc” which has a little more HP like interface but still has larger buttons and multiple stack display. Wish they had an iOS port.

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