# RPN vs Nixie Calculator

The clearest difference is in-app purchases: RPN at none against Nixie Calculator's 1. RPN also leads on review sentiment (100% vs 67%) and iOS requirement (12.0 vs 15.0). Nixie Calculator's advantage is update cadence (monthly vs every 7 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Nixie Calculator sells 1 one-off in-app purchase. RPN asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for RPN against 4.9 for Nixie Calculator. Both are backed by a comparable volume of ratings — 11 and 15 respectively. Written reviews are what separate them: 100% of RPN's written reviews are positive against 67% of Nixie Calculator's.

RPN ships an update every 7 months, Nixie Calculator monthly. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | RPN | Nixie Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (11 ratings)](https://appshunter.io/ios/app/rpn-70-sd/id738422213/reviews) | **[4.9 (15 ratings)](https://appshunter.io/ios/app/nixie-calculator/id1489019109/reviews)** |
| Number of ratings | 11 | **15** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 36 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [UNB SYSTEMS PTY LTD](https://appshunter.io/developer/1514057763) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-70-sd/id738422213)

This app is a faithful simulation of a rare 1974 financial calculator, offering all its original functions with enhanced features like more memory registers and a visual stack display. It's designed for users who appreciate vintage technology and need precise financial calculations.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Nixie Calculator

[App page](https://appshunter.io/ios/app/nixie-calculator/id1489019109)

This calculator app features a digital paper tape to display entries, which can be copied or shared. It offers various customization options like color schemes, rounding, and display modes, blending retro aesthetics with modern device technology.

**Highlights:** Paper tape for entry display, Copy and paste functionality, Customizable color schemes, Adjustable rounding and exponential modes, Classic Nixie font option, Thousand separator styles

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Color Layouts | $2.99 | one-time |


## Frequently asked questions

### Is RPN free?

RPN is free to download, with no in-app purchases.

### Is Nixie Calculator free?

Nixie Calculator is free to download, with in-app purchases available.

### Which has better reviews, RPN or Nixie Calculator?

Nixie Calculator is rated higher. RPN averages 4.7 out of 5 from 11 ratings, while Nixie Calculator averages 4.9 from 15 ratings.

### Do RPN or Nixie Calculator have ads?

Neither RPN nor Nixie Calculator shows ads.

### Which is updated more often, RPN or Nixie Calculator?

RPN ships an update every 7 months, and Nixie Calculator monthly. Most recently, RPN was updated on November 1, 2026 and Nixie Calculator on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*