# Engine RPM vs Spin Counter Plus

The clearest difference is rating: Engine RPM at 4.0 against Spin Counter Plus's 1.0. Engine RPM also leads on ratings volume (35 vs 1). Spin Counter Plus's advantage is price ($2.99 vs $8.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

Engine RPM costs $8.99 and Spin Counter Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Engine RPM holds the better App Store score, 4.0 against 1.0. That said, the two scores are not equally well evidenced: Engine RPM has 35 ratings behind it against 1, so its average is the more settled of the two.

Engine RPM ships an update every 26 months, Spin Counter Plus every 38 months. The most recent releases landed on September 19, 2026 and June 6, 2026 respectively.

## The numbers

| Metric | Engine RPM | Spin Counter Plus |
| --- | --- | --- |
| Price | $8.99 | **$2.99** |
| Rating | **[4.0 (35 ratings)](https://appshunter.io/ios/app/engine-rpm/id340401811/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/spin-counter-plus/id6443945937/reviews) |
| Number of ratings | **35** | 1 |
| Positive reviews | 48.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 26 months** | Every 38 months |
| Monetization | **Free** | Paid |
| Size | 3 MB | 10 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Real-Time Specialties](https://appshunter.io/developer/335568332) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Engine RPM

[App page](https://appshunter.io/ios/app/engine-rpm/id340401811)

Analyze engine sound to calculate RPM using advanced signal processing. Ideal for engine setup and diagnostics, it supports various engine types and provides real-time feedback for accurate readings.

**Highlights:** Acoustic RPM measurement, Engine sound analysis, Supports 2-stroke/4-stroke engines, Configurable cylinder count, Real-time autocorrelation graph, Adjustable update periods, Low-pass filtering

**Features:** Vision Pro support

**In-app purchases:** none


### Spin Counter Plus

[App page](https://appshunter.io/ios/app/spin-counter-plus/id6443945937)

This utility tool accurately counts rotations using your device's magnetic sensor. It provides detailed data on orientation, speed, and total spins, with options to save or copy the information for further analysis. Ideal for tracking circular motion in sports or activities.

**Highlights:** 3D compass for orientation, Tap to start/stop recording, Save rotation data images, Copy data to clipboard, Display total rotations, Show rotation speed (sec/RPM)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Engine RPM free?

Engine RPM costs $8.99, with no in-app purchases.

### Is Spin Counter Plus free?

Spin Counter Plus costs $2.99, with no in-app purchases.

### Which has better reviews, Engine RPM or Spin Counter Plus?

Engine RPM is rated higher. Engine RPM averages 4.0 out of 5 from 35 ratings, while Spin Counter Plus averages 1.0 from 1 ratings.

### Do Engine RPM or Spin Counter Plus have ads?

Neither Engine RPM nor Spin Counter Plus shows ads.

### Which is updated more often, Engine RPM or Spin Counter Plus?

Engine RPM ships an update every 26 months, and Spin Counter Plus every 38 months. Most recently, Engine RPM was updated on September 19, 2026 and Spin Counter Plus on June 6, 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.*