# GO-29 SciRPN

> Accurate simulation of the HP-29C programmable scientific calculator with RPN. (iPhone/iPad app by Steve Lidie.)

- Source: https://appshunter.io/ios/app/go-29-scirpn/id1472811056 (this page in markdown: same URL + `.md`)
- Developer: [Steve Lidie](https://appshunter.io/developer/1869780159)
- Category: Utilities, Productivity
- Price: $6.99
- Rating: 5.00/5 from 5 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 26 MB
- Released: 2019-07-18
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/go-29-scirpn/id1472811056/reviews.md

## What is GO?

GO-29 SciRPN closely simulates the venerable HP-29C Programmable Pocket Scientific Calculator from 1977. Virtually indistinguishable from the real item in operation, GO-29 is a powerful yet simple retro calculator.

• RPN (Reverse Polish Notation)
• 10-digit LED calculator display, 10-99 to 10+99
• Four stack registers with roll down
•  Thirty storage registers with arithmetic memory operators:
	◦ 10 primary registers
	◦  6 statistical registers
	◦ 14 indirect registers
• Math, trigonometric, polar/rectangular, sexagesimal/decimal, logarithmic, statistical, power and other miscellaneous functions
• Programmable, with labels, subroutines, branching, conditionals, indirect addressing, annotated program listing, and memory for 198 program steps
• Library of Sample Programs
• Fast, slow or single step program execution
• Program import via pasteboard or from other Apps
• Program export via printer, email, pasteboard or to others Apps
• iTunes program File Sharing
• Two additional windows with views of:
	◦ stack/storage registers
	◦ keystroke log
	◦ program source code
	◦ program documentation
• Copy-from and Paste-to the calculator display
• Simple Paper Tape annotations

## Key features

- RPN input
- 10-digit LED display simulation
- Four stack registers
- Thirty storage registers
- Extensive math and statistical functions
- Programmable with 198 steps
- Program import/export

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/go-29-scirpn/id1472811056/reviews.md

### 5/5 — Excellent, with or without the nostalgia factor.

*2022-10-07*

The HP-29C was my go-to calculator at my first job after college, and I loved it for its power, ease of use, and flexibility. This is an outstanding and faithful simulation of that calculator. 

But even taken on its own merits, this is a solid scientific RPN calculator. Excellent functionality, solid programmability, and fast performance.

### 5/5 — Very nice calculator

*2019-12-22*

Very good job!! Only two little bugs I’ve noticed:
The description of the program appears too fast when importing, it’s also not possible to read it nor stop it.
When computing on large numbers in FIX 9 mode (with factorial program for value 69, for example) the result doesn’t show the exponential part.
Congratulations again, I was waiting for this simulation for a long time!

### 5/5 — Best in Class

*2019-08-08*

Imagine my surprise when I found the 29C in the AppStore. 
I’ve been looking for this exact model for the last 10 years. 
Of course, I bought it straightaway. 
I’d like to think I’m the first to purchase, but I doubt it - one of the first’ll do. 

Thanks so much for building this. Never saw myself as ocd. Guess I must be - bought my HP29C back in ‘75 - still working fine. 
One thing I’ll say now about the HP29C over the HP25, the ‘29 fills in all the blanks on the ‘25 keyboard. 
and, for programmers, the DEL Key is so much more practical than NOP. 
In my opinion, the HP29C was by far the best in class of its time. 20 addressable registers, Continuous memory and Subroutines put it in a different dimension from others. It’s amazing what you can do with just 98 program steps with that little lot. 
I hope you’re all going to enjoy this as much as I know I’m going to.

## Frequently asked questions about GO

### What is GO-29 SciRPN?

GO-29 SciRPN is a mobile application that closely simulates the functionality and operation of the vintage HP-29C Programmable Pocket Scientific Calculator from 1977. It provides a retro computing experience with advanced scientific and programming capabilities.

### What is RPN and does GO-29 SciRPN support it?

RPN stands for Reverse Polish Notation, a calculator input method that uses a stack. GO-29 SciRPN fully supports RPN, mirroring the input style of the original HP-29C calculator.

### How many storage registers does GO-29 SciRPN have?

GO-29 SciRPN features thirty storage registers, divided into 10 primary registers, 6 statistical registers, and 14 indirect registers, allowing for complex data management and calculations.

### Can I program calculations on GO-29 SciRPN?

Yes, GO-29 SciRPN is programmable with memory for 198 program steps. It supports labels, subroutines, branching, conditionals, and indirect addressing for creating custom calculation sequences.

### What devices does GO-29 SciRPN support?

GO-29 SciRPN is available on a wide range of Apple devices, including iPhone, iPad, iPod, Mac, and Apple TV, ensuring broad compatibility for users.

### How often is GO-29 SciRPN updated?

The app was last updated on September 17, 2024, indicating active development and support. This suggests regular maintenance and potential feature additions.

### What is the price of GO-29 SciRPN?

GO-29 SciRPN is a paid application priced at $6.99. This one-time purchase grants access to all its features without any recurring fees or advertisements.

### Does GO-29 SciRPN have ads?

No, GO-29 SciRPN is ad-free. As a paid application, it provides an uninterrupted user experience without any advertisements.

## Version history (last 5 releases)

### 26.5.1 — 2026-06-11

- Repair broken icon and update documentation.
- Update to Apple OS versions 26.5.1.

### 26.5 — 2026-05-31

- ENG display format & other bug fixes and enhancements.
- Provide a complete PDF hardcopy of the HTML user manual, including an index.
- Minimum macOS version now 13.0 (Ventura).
- Minimum iOS / iPadOS / tvOS versions now 16.0.
- Update to Apple OS versions 26.5.

### 3.1 — 2024-09-17

- Update for macOS 15.0.

### 3.0 — 2024-05-15

- New Settings option, Auxiliary View Assist, enables draggable buttons for quickly opening / closing the stack window.
- New Settings collection, Accessibility, groups High Visibility Display, Magnify Calculator and Auxiliary View Assist.
- The Settings option Auto-On now defaults to YES.
- Remove vestigial iOS 9 Settings option that assisted in migration from iCloud Documents to iCloud Drive for program storage.
- Battery power level reporting has changed in iOS, iPadOS and macOS: adjust power level monitoring algorithm to compensate.
- Bug fixes, miscellaneous improvements and internal modernization.
- Refresh documentation.
- Update for iOS 17.5, iPadOS 17.5. tvOS 17.5, macOS 14.5.

### 2.6.3 — 2024-03-09

- Fixed: problem with program entry.
- Miscellaneous improvements recommended for everyone.
- Update for iOS 17.4, iPadOS 17.4.

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## More apps by Steve Lidie

- [GO-21 SciRPN](https://appshunter.io/ios/app/go-21-scirpn/id327651563)
- [GO-25 SciRPN](https://appshunter.io/ios/app/go-25-scirpn/id408249517)
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- [Krypton](https://appshunter.io/ios/app/krypton/id1529946598)

All apps by Steve Lidie: https://appshunter.io/developer/1869780159

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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 2026-08-26.*