RPN-55 SD logo

RPN-55 SD for iOS

By CuVee Software $1.99

Developer's Description

RPN-55 SD is the first photo-realistic simulation for the iPhone of Hewlett-Packard's low-cost alternative to the famous HP-65 programmable scientific calculator. Produced from 1975 through 1977, it was the "Merlin" member of the classic HP calculator series, priced at $395. HP claimed that it featured "(...) more pre-programmed functions than any other scientific pocket calculator in the world."

A main feature of the HP-55 was a crystal-controlled 100-hr digital timer with the ability to store times while the timer was running and later recall them. On RPN-55 SD the timer may also act as a 12-hr or 24-hr clock.

While the simulator works just like the original calculator except being much faster and having twice the program memory you can turn on extended features to make it even more enjoyable to use.

RPN-55 SD comes with original HP programs built right into it.


Photo-realistic look-and-feel

Vintage mode or Extended mode

Programmable (99 steps), conditional branching

Insert and delete steps with automatic address correction

Delete range of steps

Subroutines (4 levels)

20 registers, "continuous", with unrestricted store/recall arithmetic

"Live" register view

Program listing view

Program library view

Store and retrieve any number of programs

100-hr timer supporting 10 split times and 12/24-hr clock mode

Swap unit conversions with additional functions, e.g. hyperbolics

Sharing: e-mail, AirDrop, Dropbox, copy, paste, print

Almost 100 programs pre-installed

Calculator functions:

Statistics (linear regression, mean, standard deviation, correlation coefficient, x- and y-estimates)

Trigonometric functions (degrees, radians, grads)

Polar/rectangular conversions

Inverse, square root, logarithm, exponential, pi

Storage arithmetic (store and recall)

Percent, absolute, integer, fractional value, round


Random number

Unit and hours conversions

Details: cuveesoft.ch/rpn55

Full Specifications

What's new in version 1.2


Release December 2, 2019
Date Added December 2, 2019
Version 1.2

Operating Systems

Operating Systems iOS
Additional Requirements Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


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