iPhone Screenshots


World's first pocket computer! Now running on your iPhone.

RPN-65 SD is the iPhone version of RPN-65 Pro, the first complete simulation of Hewlett-Packard's stunning HP-65 programmable calculator for iOS. Produced from 1974 to 1977 at an initial price of $795 (that's more than $4,000 today!), the HP-65 was a breakthrough. Not only was it programmable, it also contained a motorized magnetic card reader - and still fit into Bill Hewlett's shirt pocket.

Experience this revolutionary calculator on your iPhone. With over 180 original HP programs included with the app, you can get started right away.

"A work of art. Fantastic!" (MacBreak Weekly, episode 572)


• Virtual program and data cards
• Virtual 2000-line paper tape printer supports AirPrint
• Powerful database-driven card manager
• Create, delete, label, and organize a virtually unlimited number of cards
• Sharing: e-mail, AirDrop, Dropbox, iTunes, copy, paste, print
• Paste existing HP-65 listings into RPN-65 and run them
• "Live" display of stack, memory registers, program counter, flags
• Reads program and data cards created by RPN-65 Pro
• Reads data cards created by RPN-67 Pro/SD and RPN-97 Pro

Run RPN-65 SD in any of 4 modes:

1 - Just like the original HP-65
2 - Like the original HP-65, but at much higher speed
3 - With many user-interface improvements, like backstep key or jump to any program step
4 - "Super-65" with 999 program steps, 120 labels, 120 registers, nested subroutines, and much more

For details, free program downloads, calculator handbook and much more, visit the RPN-65 website: cuveesoft.ch/rpn65

What’s New

Version 3.4.1

• Fixed issue on pre-iOS 13 devices, where running RPN-65 in vintage mode set to DSP 9 would round to 8 digits

Ratings and Reviews

5.0 out of 5
7 Ratings

7 Ratings

PBraun42 ,

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.

App Privacy

The developer, CuVee Software, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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