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  • #: 228886
  • Price: $1.99 In Apple Store
  • Category: Utilities
  • Updated: 2016-12-13
  • Current Version: 2.6
  • 2.6
  • Size: 5.20 MB
  • Language: English
  • Seller: Technology Man IR
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 3.2 or later
  • Copyright (©) 2010-2011 Stephen O. Lidie
  •  Add to Favorite apps



GO-25 SciRPN simulates the venerable HP-25C Programmable Scientific Calculator. The HP-25C was released in 1976 and sold for a MSRP of $195. Virtually indistinguishable from the real item in operation, GO-25 is a powerful yet simple retro calculator.

•Requires iOS 8.0 or higher


•Copy / Paste

•Shake to clear X

•Programmable with 99 program steps, conditionals, full-speed or single step operation

•Built-in library of sample programs

•iTunes File Sharing

•Swipe-up gesture that displays the stack and memory registers, and the program listing views

•For iPad two finger drag operations for displayed views

•Addition, subtraction, multiplication, division

•Trigonometric functions : sin, cos, tan, sin⁻¹, cos⁻¹, tan⁻¹, degrees, radians or grads

•Rectangular/polar coordinate conversion

•Hours, minutes, seconds to decimal degrees conversion, and vice-versa

•Logarithmic functions : log, 10x, ln, ex

•Summation Σ+, mean, standard deviation

•Other functions : Yx, 1/x, √x, π, FRAC, INT, ABS, %

•Display : LED, 10 significant digits (8 + 2 digit exponent in scientific notation), 10-99 to 10+99

•Memory : 4 register stack, stack roll down, X-Y interchange, 10 memory registers with register math

•Optional thousands separator

What's New in Version 2.6

- Update for iOS 10.1.1.
- GO-25 now requires that your iDevice run an iOS version >= 8.

View iPhone screenshots | View iPad screenshots

iPhone Screenshots

GO-25 iPhone Screenshot 1
GO-25 iPhone Screenshot 2
GO-25 iPhone Screenshot 3
GO-25 iPhone Screenshot 4
GO-25 iPhone Screenshot 5

iPad Screenshots

GO-25 iPad Screenshot 1

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Rated 5/5 based on 3 customer reviews.


5/5 stars


This is an amazing and faithful simulation of the HP-25C with twice the program memory. The design is fantastic and looks like the real thing. The ability to import and export programs is very flexible and well thought out.
As a footnote, I still have my HP-25 that I bought in 1977 ($122) and it still works as good today as when it was new. This App brings back a lot of good memories.

5/5 stars

Well Done!

My favorite features:

*. The ability to save, email, and print programs
*. The app has a nice interface, especially the iPad version
*. This app comes with sample programs - helpful when writing notes
*. I really like the manual - well written

This is a simple yet powerful, programmable RPN calculator. BRAVO!

5/5 stars

Very nostalgic!

Great implementation of the calculator that I used 30 years ago in engineering school! Has the full functionality of the HP25, and is a lot of fun to use. I lost my original calculator years ago, but still have the application guide. So I'm able to load favorite programs like Nim and the Moon Lander. Great fun.


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