RPN-65 SD

RPN-65 SD

First programmable calculator!

8 ratings
2 reviews
$2.99

Details

  • Released
  • Updated
  • November 16, 2016
  • March 8, 2026

Features

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About

Experience a faithful simulation of the groundbreaking HP-65 programmable calculator on your iPhone. This app offers virtual program and data cards, a paper tape printer, and a robust card manager. Explore four distinct operating modes, including an enhanced "Super-65" option.

Virtual program and data cards
Virtual paper tape printer with AirPrint
Database-driven card manager
Create, delete, and organize unlimited cards
Sharing via email, AirDrop, Dropbox, iTunes
Paste and run existing HP-65 listings
Four distinct operating modes
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What's New in RPN

4.4.1

March 8, 2026

After tapping “Don't Show Again,” the button will be hidden instead of appearing greyed out.

User reviews

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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Developer apps

FAQ

What is RPN-65 SD?

RPN-65 SD is an iPhone application that provides a complete simulation of the original Hewlett-Packard HP-65 programmable calculator. It aims to replicate the functionality and experience of this historic device.

How much does RPN-65 SD cost?

RPN-65 SD is a paid application and is available for $2.99. This one-time purchase grants you access to all its features and simulations.

What devices does RPN-65 SD support?

RPN-65 SD is designed to run on iPhones and iPods. It is compatible with iOS devices, offering a portable way to use this classic calculator.

Does RPN-65 SD have ads?

No, RPN-65 SD does not contain advertisements. As a paid application, it provides an uninterrupted user experience without any in-app ads.

How often is RPN-65 SD updated?

RPN-65 SD was last updated on March 8, 2026, with version 4.4.1. While specific update frequency isn't detailed, this indicates ongoing development and support for the application.

What are the different modes in RPN-65 SD?

RPN-65 SD offers four modes: exact simulation of the original HP-65, a faster version of the original, an improved UI mode with features like backstep, and "Super-65" with expanded capabilities.

Can I share programs or data from RPN-65 SD?

Yes, RPN-65 SD supports various sharing options including email, AirDrop, Dropbox, and iTunes. You can also copy, paste, and print your data and programs.

What is the age rating for RPN-65 SD?

RPN-65 SD has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content present.