# RPN vs Vibration Detection

The clearest difference is review sentiment: Vibration Detection at 100% against RPN's 71%. RPN's advantage is price ($1.99 vs $7.99). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

RPN costs $1.99 and Vibration Detection $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RPN ships an update every 6 months, Vibration Detection every 10 months. The most recent releases landed on October 20, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | RPN | Vibration Detection |
| --- | --- | --- |
| Price | **$1.99** | $7.99 |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/rpn-35-sd/id956224485/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 10 months |
| Monetization | Paid | Paid |
| Size | 14 MB | 11 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Sebastian Bub Software Distribution](https://appshunter.io/developer/311613696) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-35-sd/id956224485)

This app emulates the first pocket scientific calculator, offering a photo-realistic vintage experience. It simulates original operating speeds and unique arithmetic bugs, with optional modern enhancements like non-volatile registers.

**Highlights:** Photo-realistic look-and-feel, Multiple vintage skins, Vintage and Enhanced modes, Optional key-click and key-glow, Swipe to correct input, Display stack and memory registers

**Features:** macOS Compatibility

**In-app purchases:** none


### Vibration Detection

[App page](https://appshunter.io/ios/app/vibration-detection/id1342366914)

Analyze and diagnose vibration issues in vehicles or other systems. This tool uses your device's accelerometer to measure frequencies, identify potential sources like wheels or cardan shafts, and visualize results in interactive charts.

**Highlights:** Create car projects with custom data, Measure and analyze vibration frequencies, Visualize results in interactive charts, Identify potential vibration sources, Export measurements and project data, Integrated vehicle analysis tool

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Is Vibration Detection free?

Vibration Detection costs $7.99, with no in-app purchases.

### Do RPN or Vibration Detection have ads?

Neither RPN nor Vibration Detection shows ads.

### Which is updated more often, RPN or Vibration Detection?

RPN ships an update every 6 months, and Vibration Detection every 10 months. Most recently, RPN was updated on October 20, 2026 and Vibration Detection on October 21, 2026.

---

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