# RPN-65 Pro — First programmable calculator!

> Simulates the HP-65 programmable calculator with virtual cards and original programs. (iPhone/iPad app by Willy Kunz.)

- Source: https://appshunter.io/ios/app/rpn-65-pro/id1033260498 (this page in markdown: same URL + `.md`)
- Developer: [Willy Kunz](https://appshunter.io/developer/424873503)
- Category: Productivity, Utilities
- Price: $3.99
- Rating: 4.00/5 from 4 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 86 MB
- Languages: English
- Released: 2015-09-03
- Data updated: 2026-06-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rpn-65-pro/id1033260498/reviews.md

## What is RPN?

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

RPN-65 Pro is 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 close to $5,000 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 iPad. With 170 original HP programs included with RPN-65 Pro, you can get started right away.

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


Features:

• Virtual program and data cards
• Virtual 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, copy, paste, print
• Paste existing HP-65 listings into RPN-65 and run them
• "Live" display of stack, memory registers, program counter, flags
• Reads data cards created by RPN-67 Pro and RPN-97 Pro
• Supports external hardware keyboard


Run RPN-65 Pro in any of 4 modes:

1 - Just like the original HP-65
2 - Same, but at high speed
3 - Includes user-interface improvements, like backstep key and 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

## Key features

- Virtual program and data cards
- Virtual paper tape printer
- Database-driven card manager
- Create, delete, label, and organize cards
- Share via email, AirDrop, Dropbox, print
- Paste and run existing HP-65 listings
- Live display of stack and registers
- Four operational modes including 'Super-65'

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/rpn-65-pro/id1033260498/reviews.md

### 1/5 — Was five stars until you got rid of portrait mode

*2020-01-23, version 3.0*

What a dumb decision. The calculator itself is shaped to be held in a portrait mode. Forcing it to be in landscape mode just makes it too small to be properly usable.

### 5/5 — Really nice !

*2015-09-04, version 1.0*

This is a great emulator and recreates the feeling of using the original.  Lots of enhanced features.

## Frequently asked questions about RPN

### What is RPN-65 Pro?

RPN-65 Pro is a simulation of the Hewlett-Packard HP-65 programmable calculator, designed to run on iPads. It aims to replicate the functionality and experience of the original device.

### How much does RPN-65 Pro cost?

RPN-65 Pro is a paid application, available for $3.99. This one-time purchase grants access to all its features.

### Does RPN-65 Pro have ads?

No, RPN-65 Pro is ad-free. As a paid application, it does not contain any advertisements.

### What devices does RPN-65 Pro support?

RPN-65 Pro is exclusively designed for iPads. It is not available on iPhones or other Apple devices.

### How often is RPN-65 Pro updated?

The latest version, 4.6, was last updated on April 9, 2026. While specific update frequency isn't detailed, this indicates ongoing development and support.

### Can I use RPN-65 Pro offline?

Yes, RPN-65 Pro functions as a standalone calculator simulation and does not require an internet connection to operate, allowing for offline use.

### What are the different modes in RPN-65 Pro?

RPN-65 Pro offers four modes: original HP-65 simulation, high-speed original simulation, improved user interface with backstep and jump, and 'Super-65' with expanded program steps and registers.

### What is the user sentiment for RPN-65 Pro?

User feedback has been positive, with MacBreak Weekly calling it 'A work of art. Fantastic!'. The app holds a 4.0-star rating from 4 ratings.

## Version history (last 5 releases)

### 4.6 — 2026-04-09

• In the Card Manager ("Cards"), the green label fields of user cards may be edited in W/PRGM mode, with "Show Card Content" set to off.

• Improved support of Silicon Macs.

### 4.5 — 2026-03-11

Bug fix

### 4.4 — 2026-03-08

• In the Card Manager ("Cards"), quickly scroll to the program code for any user key. For HP program cards, tap the corresponding label letter (A..E). For user program cards, tap the green label field. 

• Visual optimizations for iOS 26.

### 4.3 — 2025-05-11

• Faster startup – no delay until the first button press is recognized after switching on.

### 4.2 — 2025-03-07

• In "Plus" mode, results such as 9.99×10⁹⁹ now appear correctly rounded both in the display and on the printer for all decimal point settings, e.g. DSP 1 (in contrast to the original HP-65).

• Certain calculations, e.g. 100⁷⁵, caused the app to crash.

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## More apps by Willy Kunz

- [RPN-45 HD](https://appshunter.io/ios/app/rpn-45-hd/id424873500)
- [RPN-70 HD](https://appshunter.io/ios/app/rpn-70-hd/id436127144)
- [Smart Sudoku](https://appshunter.io/ios/app/smart-sudoku/id457564906)
- [Vintage-45](https://appshunter.io/ios/app/vintage-45/id506402272)
- [RPN-45 SD](https://appshunter.io/ios/app/rpn-45-sd/id509923051)
- [RPN-67 NP](https://appshunter.io/ios/app/rpn-67-np/id603100249)

All apps by Willy Kunz: https://appshunter.io/developer/424873503

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*