# RPN-45 HD

> Vintage Calculator (1973)

Canonical page: [https://chrome-stats.com/d/id424873500](https://chrome-stats.com/d/id424873500)

## Overview

- **ID:** `id424873500`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** CuVee Software
- **Category:** Productivity
- **Rating:** 4.80 / 5 (6 ratings)
- **Version:** 6.5
- **Last updated:** 2026-03-09
- **First published:** 2011-03-17
- **Size:** 58 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/rpn-45-hd/id424873500)
- **Website:** [http://cuveesoft.ch](http://cuveesoft.ch/)
- **Privacy policy:** [http://cuveesoft.ch/privacy](http://cuveesoft.ch/privacy)

## Description

RPN-45 HD is a complete simulation of the scientific hand-held calculator HP-45 from 1973. Processing times and behavior have been carefully modelled after the original. Switch to the "Super-45" mode and watch the HP-45 do things never seen before.

Features:

• Photo-realistic look based on an existing device
• Animated keys with adjustable click sound and visual feedback
• All functions and operations of the HP-45 fully implemented
• Supports "secret" timer. Use it as 12/100-hours timer or even as a chess clock.
• Optional hyperbolic functions
• Simulation of the HP-45's computation times (optional)
• Correct wrong number entries by swiping left across the display
• Cut/copy/paste display value
• "Live" display of stack and all memory registers (in landscape mode)
• Built-in manual
• 30 selectable background images, even add your own
• HP-91-like paper tape printer:
  - Supports MAN, ALL, and NORM modes
  - Quickly insert arbitrary text
  - Delete any line
  - Send tape via E-Mail or to any AirPrint-capable printer
  - Ribbon color black or blue
  - Optionally print negative results in red
  - Print stack and registers
• Supports external hardware keyboard

Turn on "Super-45" and enjoy a super-charged HP-45:

• Complex numbers: available for almost all operations and functions
• More memory: twice the number of memory registers.
• "Continuous" stack and memory registers

• Improved functions:
  - Raise any number to any power
  - Factorial of any number, incl. complex
  - Logarithm and square root of negative numbers
  - Preset timer with the iPad's real time
  - Chess clock mode

• New functions:
  - Solve linear equations in two or three unknowns
  - Find the roots of quadratic and cubic equations
  - Statistics: normal distribution and correlation coefficient of paired variables
  - Linear regression, combinations, permutations
  - Logarithm to any base, incl. complex
  - Integer and fractional parts
  - Display rounding
  - Random numbers in a given range
  - Day of the week for any date between Jan 1, 0001 and Dec 31, 9999
  - Easter date for any year between 1583 and 4099
  - Support for Julian dates
  - Number of days between any two dates
  - Last Stack
  - Convert display value to hexadecimal
  - Percentage of sum
  - Register arithmetic includes sum registers and LAST x
  - Clear all registers
  - Backup registers in a protected area

• Enhanced user interface:
  - Visual indicators for prefix keys and angular modes
  - Small values switch to scientific notation if required
  - Localized decimal point
  - Thousand's separator

For more information and sample calculations visit cuveesoft.ch/rpn45/en

WHAT USERS SAID:

"A great simulation of the HP-45. Beautifully made, with a lot of attention to small details."
"This is by far the best RPN calculator available for the iPad!"
"This is one of the most accurate but also nicest looking emulators I have come across for the HP-45, or any vintage HP calculator for that matter."
"This is exactly what I've been searching. My HP 45 packed up some time ago. Thank you so much!"

## Rankings

- #408,120 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id424873500)