RPN 30

Couldn’t ask for a better RPN calculator for iOS

The rpn app I had been using for years is no longer available, so I switched to this one. I’m glad I did; it’s very good. I had a question about using it and emailed the developer; he got right back to me with the information I needed. If you use reverse Polish notation, give this a try.

Does what it needs, doesn't beg you for money, stays out of your way and lets you calculate. Thank you so much!

RPN30 is a fantastic implementation of RPN in an easy to understand and use calculator. The HP calculator emulators are good but can be too complex and have unneeded features for 90% of people's need. This will be my go-to everyday calculator.

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

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.

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.

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! :)

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...

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.