# Engine RPM vs Motool Service Assistant

The clearest difference is price: Motool Service Assistant at Free against Engine RPM's $8.99. Motool Service Assistant also leads on update cadence (every 8 days vs every 26 months). Engine RPM's advantage is rating (4.0 vs 3.3) and in-app purchases (none vs 2). On ratings volume, ads, device support and iOS requirement there is nothing between them.

Motool Service Assistant is free to download; Engine RPM costs $8.99 up front. Motool Service Assistant sells 2 in-app purchases, starting at $0.99 per month. Engine RPM asks for nothing beyond the download.

Engine RPM holds the better App Store score, 4.0 against 3.3. Both are backed by a comparable volume of ratings — 35 and 24 respectively. Written reviews point the same way: 48% of Engine RPM's written reviews are positive against 32% of Motool Service Assistant's.

Engine RPM ships an update every 26 months, Motool Service Assistant every 8 days. The most recent releases landed on September 25, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Engine RPM | Motool Service Assistant |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | **[4.0 (35 ratings)](https://appshunter.io/ios/app/engine-rpm/id340401811/reviews)** | [3.3 (24 ratings)](https://appshunter.io/ios/app/motool-service-assistant/id1444719113/reviews) |
| Number of ratings | **35** | 24 |
| Positive reviews | **48.4% of reviews** | 31.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 8 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 233 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Real-Time Specialties](https://appshunter.io/developer/335568332) | [Motool Inc](https://appshunter.io/developer/1444719112) |

## 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


### Motool Service Assistant

[App page](https://appshunter.io/ios/app/motool-service-assistant/id1444719113)

This app helps motorcycle and mountain bike owners track maintenance tasks, log suspension settings, and record ride notes. It offers reminders for upcoming services and supports managing multiple bikes. An optional subscription unlocks advanced features and a virtual remote display.

**Highlights:** Service task tracking, Suspension setting logs, Ride notes documentation, Service interval reminders, Unlimited bike management, Virtual remote display

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Service Assistant | $0.99 | per month |
| Service Assistant | $9.99 | per year |


## Frequently asked questions

### Is Engine RPM free?

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

### Is Motool Service Assistant free?

Motool Service Assistant is free to download, with in-app purchases available.

### Which has better reviews, Engine RPM or Motool Service Assistant?

Engine RPM is rated higher. Engine RPM averages 4.0 out of 5 from 35 ratings, while Motool Service Assistant averages 3.3 from 24 ratings.

### Do Engine RPM or Motool Service Assistant have ads?

Neither Engine RPM nor Motool Service Assistant shows ads.

### Which is updated more often, Engine RPM or Motool Service Assistant?

Engine RPM ships an update every 26 months, and Motool Service Assistant every 8 days. Most recently, Engine RPM was updated on September 25, 2026 and Motool Service Assistant on September 20, 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.*