# Engine RPM vs MyVoltControl

The clearest difference is price: MyVoltControl at Free against Engine RPM's $8.99. MyVoltControl also leads on update cadence (every 5 weeks vs every 26 months) and rating (4.3 vs 4.0). Engine RPM's advantage is in-app purchases (none vs 5) and iOS requirement (13.0 vs 15.0). On review sentiment, ratings volume, ads and device support there is nothing between them.

MyVoltControl is free to download; Engine RPM costs $8.99 up front. MyVoltControl sells 5 one-off in-app purchases. Engine RPM asks for nothing beyond the download.

MyVoltControl holds the better App Store score, 4.3 against 4.0. Both are backed by a comparable volume of ratings — 35 and 16 respectively. Written reviews point the same way: 48% of Engine RPM's written reviews are positive against 50% of MyVoltControl's.

Engine RPM ships an update every 26 months, MyVoltControl every 5 weeks. The most recent releases landed on September 19, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Engine RPM | MyVoltControl |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | [4.0 (35 ratings)](https://appshunter.io/ios/app/engine-rpm/id340401811/reviews) | **[4.3 (16 ratings)](https://appshunter.io/ios/app/myvoltcontrol/id1488646304/reviews)** |
| Number of ratings | **35** | 16 |
| Positive reviews | 48.4% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 20 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Real-Time Specialties](https://appshunter.io/developer/335568332) | [Craftin De Apps LLC](https://appshunter.io/developer/1488646303) |

## 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


### MyVoltControl

[App page](https://appshunter.io/ios/app/myvoltcontrol/id1488646304)

Enhance your Chevrolet Volt or Bolt experience with advanced control features. This app allows you to manage vehicle modes, monitor performance, and access diagnostic information, requiring an OBD adapter for full functionality.

**Highlights:** Vehicle information pages, Simulated Hold mode for ICE management, Engine run and off control, Reset lifetime fuel economy, EV and ICE travel distance calculation, Diagnostic trouble code access

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Volt Hold Function | $0.99 | one-time |
| Volt Lifetime Function | $1.99 | one-time |
| Volt Diag Function | $1.99 | one-time |
| Volt 12v Function. | $1.99 | one-time |
| Volt Afterblow Function | $2.99 | one-time |


## Frequently asked questions

### Is Engine RPM free?

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

### Is MyVoltControl free?

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

### Which has better reviews, Engine RPM or MyVoltControl?

MyVoltControl is rated higher. Engine RPM averages 4.0 out of 5 from 35 ratings, while MyVoltControl averages 4.3 from 16 ratings.

### Do Engine RPM or MyVoltControl have ads?

Neither Engine RPM nor MyVoltControl shows ads.

### Which is updated more often, Engine RPM or MyVoltControl?

Engine RPM ships an update every 26 months, and MyVoltControl every 5 weeks. Most recently, Engine RPM was updated on September 19, 2026 and MyVoltControl on September 25, 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.*