RPN User Reviews

Is RPN Safe?

Not enough ratings yet to assess RPN.

Is RPN Legit?

RPN-65 SD appears to be a legitimate app. AppsHunter Legitimacy Score for RPN is 90/100.

Based on 90 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

Top!!

Klasse Software, sehr aufwendig und ausgeklügelt. Alles wird gut erklärt, toll!!

Lovely, useful—now with haptic key clicks!

It seems just a few weeks ago I asked for haptic key click and now here it is! This is a nifty reminder of the satisfying “thunk” of the famously high quality keys of these classic physical calculators.

My go-to calculator

I’ve always been an HP calculator fan. My first calculator was a National Semiconductor RPN scientific. But I couldn’t afford the HP’s when I was in school.

Now that I have an iPhone in my pocket every day, I don’t have as much need for a separate physical calculator. I’ve tried an HP-41c emulator that was somewhat disappointing. Andy Ihnatko recommended this one, so I gave it a shot. Graphically perfect. Keys are extremely responsive. The program card animation makes me smile.

I somehow hit a button that put me in a weird mode. I couldn’t get out of it, so I emailed the developer. He got back to me within a day and helped me reverse my stupidity.

I can’t recommend this one highly enough.
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