---
title: "RPN-38 CX - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "RPN-38 CX is the first photo-realistic simulation of Hewlett-Packard's popular high-end programmable business calculator HP-38C for the iPhone. Produced from 1979 through 1983, it was the "Chive" memb"
---

# RPN-38 CX — United States
> Great classic calculator

![RPN-38 CX App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/1f/8a/e0/1f8ae0d5-4c2c-6828-7752-52aed17dfa2b/AppIcon-0-1x_U007emarketing-0-7-85-220-0.png/434x0w.png)

**Developer:** [Willy Kunz](https://apptail.io/developer/willy-kunz-XNx) (Switzerland)
**Category:** Productivity
**Rating:** 5.0/5 (6 ratings)
**Price:** Free
**Bundle ID:** ch.cuveesoft.rpn38cx
**Store:** Apple App Store
**Country:** United States
**Version:** 4.2 (released 2025-10-15)
**Original Release:** 2016-02-18
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1082636662)
**AppTail Page:** [https://apptail.io/app/rpn-38-cx-Pcve/united-states](https://apptail.io/app/rpn-38-cx-Pcve/united-states)

## RPN-38 CX Description
RPN-38 CX is the first photo-realistic simulation of Hewlett-Packard's popular high-end programmable business calculator HP-38C for the iPhone. Produced from 1979 through 1983, it was the "Chive" member of the third-generation HP calculators known as the "Spice" series.

While the simulator works like the original calculator, a number of carefully designed extensions make it a lot easier to use.

RPN-38 CX is fully compatible with the HP-12C, except for calculations and programs involving Bonds and Depreciation.


Features:

• Photo-realistic look-and-feel
• Programmable (99 steps, program memory not shared with register memory)
• Subroutines, flags, loop control, extended conditional branching
• Insert and delete steps with automatic address correction
• 20 registers, "continuous", with unlimited store/recall arithmetic
• Indirect register addressing
• Register view
• Program listing view
• Program library view
• Additional functions (nominal and effective interest rate)
• Shortcuts for often-used key combinations
• Store and retrieve any number of programs
• Sharing: e-mail, AirDrop, Dropbox, copy, paste, print
• 40 programs pre-installed

Calculator functions:
• Percentage (%, ∆%, %Total)
• Simple and Compound Interest
• Optional odd periods (like HP-12)
• Nominal/Effective interest rate conversion
• Amortization
• Discounted Cash Flow Analysis
• Net Present Value, Internal Rate of Return
• Date and Calendar (actual or 30/360 day basis)
• Statistics (mean, weighted mean, standard deviation)
• Linear Regression
• Additional functions not found on the HP-38:
- Subroutines, flags, loop control, random number, Pi, Log, x² and more

Details: cuveesoft.ch/rpn38

## RPN-38 CX Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d4/28/82/d4288225-c2a8-1ff9-fa1e-f75e2dc79a0e/1e.png/1242x2208.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/71/31/7f/71317f9a-4d54-7986-8433-5d76f9714a66/2.png/1242x2208.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c3/51/4c/c3514cb1-67e1-7cae-84fe-90528f3e78f9/3.png/1242x2208.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/42/26/5d/42265d69-cf23-e685-7f6f-4950125d36bd/4.png/1242x2208.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/3e/54/a6/3e54a6fa-6f59-cabe-27c7-d0d01be46790/5.png/1242x2208.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/78/ab/be/78abbe7e-1533-10c0-d497-f4aefe85dd36/6.png/1242x2208.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/77/82/54/778254d6-d6bb-68b6-ce25-c28bb8a424a2/7.png/1242x2208.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/11/85/3a/11853a17-583d-aeee-de4e-2dd45e295083/8.png/1242x2208.png)

## RPN-38 CX Rating Breakdown in United States
- 5 stars: 6 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)

## RPN-38 CX Reviews in United States

### ***** "I love it !"
For a financial person, this is as good as it gets.  I've always loved the vertical format of the HP-38 and the red LED.  This is about as perfect an emulation of the original as one could ask for.  This one adds many extra features, like subroutines and flags, and is so easy to program.  Accuracy is perfect and I love that I can save and load programs and constants as well.  Great job, Mr. Kunz!!!
-- Iowa_Florence, 2019-02-10

### ***** "That is almost as good as original!"
I have not used this particular model, but others either side and you have captured the essence of the product and its efficiency. Have to look at the others now.
-- aussie guy, 2019-01-30

[View all RPN-38 CX reviews and detailed analytics on AppTail](https://apptail.io/account/signup?utm_campaign=ai-crawl&utm_content=reviews)




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## RPN-38 CX Available In
- [United States](https://apptail.io/app/rpn-38-cx-Pcve/united-states)
- [Germany](https://apptail.io/app/rpn-38-cx-Pcve/germany)
- [China](https://apptail.io/app/rpn-38-cx-Pcve/china)
- [Kazakhstan](https://apptail.io/app/rpn-38-cx-Pcve/kazakhstan)
- [Brazil](https://apptail.io/app/rpn-38-cx-Pcve/brazil)
- [Canada](https://apptail.io/app/rpn-38-cx-Pcve/canada)
- [France](https://apptail.io/app/rpn-38-cx-Pcve/france)
- [Italy](https://apptail.io/app/rpn-38-cx-Pcve/italy)
- [Portugal](https://apptail.io/app/rpn-38-cx-Pcve/portugal)
- [Colombia](https://apptail.io/app/rpn-38-cx-Pcve/colombia)
- [Czechia](https://apptail.io/app/rpn-38-cx-Pcve/czechia)
- [Denmark](https://apptail.io/app/rpn-38-cx-Pcve/denmark)
- [Dominican Republic](https://apptail.io/app/rpn-38-cx-Pcve/dominican-republic)
- [Algeria](https://apptail.io/app/rpn-38-cx-Pcve/algeria)
- [Ecuador](https://apptail.io/app/rpn-38-cx-Pcve/ecuador)
- [Egypt](https://apptail.io/app/rpn-38-cx-Pcve/egypt)
- [Spain](https://apptail.io/app/rpn-38-cx-Pcve/spain)
- [Finland](https://apptail.io/app/rpn-38-cx-Pcve/finland)
- [United Kingdom](https://apptail.io/app/rpn-38-cx-Pcve/united-kingdom)
- [Greece](https://apptail.io/app/rpn-38-cx-Pcve/greece)
- [Hong Kong SAR China](https://apptail.io/app/rpn-38-cx-Pcve/hong-kong)
- [Hungary](https://apptail.io/app/rpn-38-cx-Pcve/hungary)
- [Indonesia](https://apptail.io/app/rpn-38-cx-Pcve/indonesia)
- [Ireland](https://apptail.io/app/rpn-38-cx-Pcve/ireland)
- [Israel](https://apptail.io/app/rpn-38-cx-Pcve/israel)
- [India](https://apptail.io/app/rpn-38-cx-Pcve/india)
- [Iceland](https://apptail.io/app/rpn-38-cx-Pcve/iceland)
- [Japan](https://apptail.io/app/rpn-38-cx-Pcve/japan)
- [South Korea](https://apptail.io/app/rpn-38-cx-Pcve/south-korea)
- [Kuwait](https://apptail.io/app/rpn-38-cx-Pcve/kuwait)
- [Lebanon](https://apptail.io/app/rpn-38-cx-Pcve/lebanon)
- [Lithuania](https://apptail.io/app/rpn-38-cx-Pcve/lithuania)
- [Mexico](https://apptail.io/app/rpn-38-cx-Pcve/mexico)
- [Malaysia](https://apptail.io/app/rpn-38-cx-Pcve/malaysia)
- [Nigeria](https://apptail.io/app/rpn-38-cx-Pcve/nigeria)
- [Netherlands](https://apptail.io/app/rpn-38-cx-Pcve/netherlands)
- [Norway](https://apptail.io/app/rpn-38-cx-Pcve/norway)
- [New Zealand](https://apptail.io/app/rpn-38-cx-Pcve/new-zealand)
- [Peru](https://apptail.io/app/rpn-38-cx-Pcve/peru)
- [Philippines](https://apptail.io/app/rpn-38-cx-Pcve/philippines)
- [Pakistan](https://apptail.io/app/rpn-38-cx-Pcve/pakistan)
- [Poland](https://apptail.io/app/rpn-38-cx-Pcve/poland)
- [Romania](https://apptail.io/app/rpn-38-cx-Pcve/romania)
- [Russia](https://apptail.io/app/rpn-38-cx-Pcve/russia)
- [Saudi Arabia](https://apptail.io/app/rpn-38-cx-Pcve/saudi-arabia)
- [Sweden](https://apptail.io/app/rpn-38-cx-Pcve/sweden)
- [Singapore](https://apptail.io/app/rpn-38-cx-Pcve/singapore)
- [Slovenia](https://apptail.io/app/rpn-38-cx-Pcve/slovenia)
- [Thailand](https://apptail.io/app/rpn-38-cx-Pcve/thailand)
- [Tunisia](https://apptail.io/app/rpn-38-cx-Pcve/tunisia)
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- [Taiwan](https://apptail.io/app/rpn-38-cx-Pcve/taiwan)
- [Ukraine](https://apptail.io/app/rpn-38-cx-Pcve/ukraine)
- [Vietnam](https://apptail.io/app/rpn-38-cx-Pcve/vietnam)
- [United Arab Emirates](https://apptail.io/app/rpn-38-cx-Pcve/united-arab-emirates)
- [South Africa](https://apptail.io/app/rpn-38-cx-Pcve/south-africa)
- [Argentina](https://apptail.io/app/rpn-38-cx-Pcve/argentina)
- [Austria](https://apptail.io/app/rpn-38-cx-Pcve/austria)
- [Australia](https://apptail.io/app/rpn-38-cx-Pcve/australia)
- [Azerbaijan](https://apptail.io/app/rpn-38-cx-Pcve/azerbaijan)
- [Belgium](https://apptail.io/app/rpn-38-cx-Pcve/belgium)
- [Belarus](https://apptail.io/app/rpn-38-cx-Pcve/belarus)
- [Switzerland](https://apptail.io/app/rpn-38-cx-Pcve/switzerland)
- [Chile](https://apptail.io/app/rpn-38-cx-Pcve/chile)

---

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