# RPN-70 SD — Very rare vintage calculator

> Vintage HP-70 financial calculator simulation with enhanced features. (iPhone/iPad app by CuVee Software.)

- Source: https://appshunter.io/ios/app/rpn-70-sd/id738422213 (this page in markdown: same URL + `.md`)
- Developer: [CuVee Software](https://appshunter.io/developer/424873503)
- Category: Productivity, Finance
- Price: Free
- Rating: 4.70/5 from 11 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 17 MB
- Languages: American English, German (Germany)
- Released: 2013-11-12
- Data updated: 2026-08-26
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rpn-70-sd/id738422213/reviews.md

## What is RPN?

RPN-70 SD is a complete simulation of the financial hand-held calculator HP-70 from 1974. It handles loan amortization, saving plans, depreciation, and much more with ease.

What users said:

"Looks good, all functions you need. Love it!"

"This is a beautiful emulation of a very rare HP financial calculator from 1974. Works just like the original but better! Faster, more accurate, with 10 more storage registers, and a popup window lets you see the contents of each stack, financial and storage register. Provides TVM4 functionality for compound interest as well as accumulated simple interest. A true work of art!"

Features:
• Photo-realistic look based on an existing device
• Animated keys with click sound (adjustable volume)
• All functions and operations of the HP-70 fully implemented
• Correct wrong number entries by swiping across the display
• Cut/copy/paste of display value
• Double-tap display to view the stack and memory registers
• Visual indicators keep track of input parameters entered
• 10 non-volatile memory registers (not available in original HP-70)

The HP-70 was discontinued after just one year. It is one of the rarest calculators, hard to find in any condition.

NOTE:
RPN-70 SD is a faithful simulation of a vintage HP-70 calculator, as has been verified against a real device using the examples in the Applications Cookbook section of the HP-70 manual. In certain cases, what may appear like a bug of the app is actually an idiosyncrasy of the HP-70.

IMPORTANT: The HP-70 requires exactly three input parameters from the top-row keys, at least one of them being either "n" or "i". In other words, you can't use PMT, PV, and FV as input parameters simultaneously.

A version for the iPhone named "RPN-70 HD" is also available.

Short manual and sample calculations on the website: www.cuveesoft.ch

## Key features

- Photo-realistic vintage calculator design
- Full HP-70 function simulation
- Animated keys with sound
- Enhanced stack and memory register view
- Cut/copy/paste display value
- Input parameter visual indicators

## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/rpn-70-sd/id738422213/reviews.md

### 5/5 — Love it

*2023-03-15*

for it’s elegant and simple interface.

### 4/5 — Display problem on iPhone 13 Pro

*2023-02-26*

I love the iPad version of this app. On my iPhone 13 Pro ist the display off, there is a glitch and the display of the results are not readable. I am.happy to provide a screenshot. I'd appreciate if the developer could look at the problem, thanks.

### 5/5 — 5318008

*2021-10-31*

55378008

### 5/5 — A Very Useful and Classic Tool

*2021-05-31*

Many sincere thanks to the development team.

### 4/5 — No rotation on iPad is a shame

*2020-04-23*

Like all of the emulators from CuVee this not only reproduces the ground-breaking wonders of long ago from Hewlett Packard,  but turbocharges them with modern day computing power. It is simply superb!

My only gripe is minor and has already noted by the developer. Unlike the HP-70HD - which I also have (of course!) - it does not rotate to landscape view which seems a little inconsistent with its 5 star cousin.

That said, My previous 3 star rating was harsh: this IS a fantastic calculator; but for me its slight loss of practicality sees it just fall just short of 5 stars.

**Developer response:** iPhones are too small to allow operating portrait-oriented calculators in landscape mode in any reasonable way. Unless the layout changes totally in landscape mode, which is not the idea of these simulators.
If you run RPN-70 SD on an iPad, please note that there exists an iPad-only version, RPN-70 HD, which fully supports landscape mode.

### 5/5 — Für HP gewohnte Nutzer

*2020-04-14*

Schönes einfaches gut nutzbares Tool. Für HP Gewohnte unentbehrlich.
Es wäre schön, wenn der Entwickler auch einen HP-Rechnet mit den + - : * Tasten auf der rechten Seite. anbieten würde

### 5/5 — Amazing! Perfect emulation of a classic calculator

*2019-03-02*

I have several Cuveesoft calculators and all are excellent. I use the RPN-70 SD for personal finance.

### 5/5 — A Perfect Calculator App

*2019-01-24*

Perfect RPN App for my needs. Simple interface, but has enough basic financial functions to meet my needs. True to the original. Love the extra memory !

### 4/5 — Hübsches Tool

*2017-10-16*

Eine sinnvolle App! Leider konnte ich nicht heraus finden, wie man eine durch den Befehl „STO“ gespeicherte Zahl wieder zurück holen kann (Der Befehl „RCL“ für recall fehlt (konnte ich nicht finden). Trotzdem 4 Sterne.

## Frequently asked questions about RPN

### What is RPN-70 SD?

RPN-70 SD is a complete simulation of the rare 1974 financial calculator, the HP-70. It replicates the original device's functions while offering improvements like more memory registers and a visual display of the stack and memory contents.

### Is RPN-70 SD free to use?

Yes, RPN-70 SD is available for free. It does not contain advertisements or in-app purchases, offering a completely free experience for users.

### What devices does RPN-70 SD support?

RPN-70 SD is designed for Apple devices and supports iPhones and iPods. A version for the iPhone, named 'RPN-70 HD', is also available.

### How accurate is RPN-70 SD?

RPN-70 SD is a faithful simulation verified against a real HP-70 device using its manual. While it aims for accuracy, some perceived 'bugs' might be idiosyncrasies of the original HP-70 calculator.

### Can I edit incorrect entries in RPN-70 SD?

Yes, RPN-70 SD allows you to correct wrong number entries by simply swiping across the display. This feature enhances usability compared to the original device.

### How often is RPN-70 SD updated?

The latest version of RPN-70 SD is 3.4.1, last updated on October 17, 2025. This indicates a commitment to maintaining and potentially improving the application.

### What are the key financial functions available in RPN-70 SD?

RPN-70 SD handles loan amortization, saving plans, depreciation, TVM (Time Value of Money) calculations for compound interest, and accumulated simple interest, among other financial operations.

### Does RPN-70 SD have ads?

No, RPN-70 SD is ad-free. The application does not contain advertisements, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 3.4.1 — 2025-10-17

• Improved compatibility with iPhone Air and iOS 26.

### 3.4 — 2025-07-28

• All registers are now non-volatile.

• Triple-tapping the display:
  - Clears the stack, the financial registers, and register M.
  - Resets the register K to 12.

### 3.3 — 2025-05-09

• Faster startup – no delay until the first button press is recognized after switching on.

### 3.2 — 2024-11-07

• Disabled low-battery indicator (all decimal points lit) when running on Apple Silicon Mac.

• Visual adjustments to iPhone 16 Pro and iPhone 16 Pro Max.
  
• RPN-70 SD requires iOS 12 or later.

### 3.1.5 — 2022-09-22

Compatibility with iPhone 14 Pro

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## More apps by CuVee Software

- [RPN-45 HD](https://appshunter.io/ios/app/rpn-45-hd/id424873500)
- [RPN-70 HD](https://appshunter.io/ios/app/rpn-70-hd/id436127144)
- [Smart Sudoku](https://appshunter.io/ios/app/smart-sudoku/id457564906)
- [Vintage-45](https://appshunter.io/ios/app/vintage-45/id506402272)
- [RPN-45 SD](https://appshunter.io/ios/app/rpn-45-sd/id509923051)
- [RPN-67 NP](https://appshunter.io/ios/app/rpn-67-np/id603100249)

All apps by CuVee Software: https://appshunter.io/developer/424873503

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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.*