# Accel Synth vs Engine Sounds

The clearest difference is in-app purchases: Engine Sounds at none against Accel Synth's 8. Engine Sounds also leads on iOS requirement (13.0 vs 15.1). Accel Synth's advantage is update cadence (every 3 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Accel Synth sells 8 in-app purchases, starting at $0.99 per month. Engine Sounds asks for nothing beyond the download.

Accel Synth ships an update every 3 days, Engine Sounds every 4 months. The most recent releases landed on September 29, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Accel Synth | Engine Sounds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/engine-sounds-superrev/id6770043689/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 4 months |
| Monetization | — | Ad-supported |
| Size | 37 MB | 166 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Resonance Logic, LLC](https://appshunter.io/developer/1763547315) | [YOUNESS HARNAFI](https://appshunter.io/developer/1894624940) |

## What reviewers say

### Accel Synth

[App page](https://appshunter.io/ios/app/accel-synth/id6745577640)

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| I like the app | $0.99 | per month |
| I want the app to be better | $4.99 | per month |
| Add new sounds faster!!! | $9.99 | per month |
| I’m rich | $100.00 | per month |
| I like the app | $0.99 | one-time |
| I want the app to be better | $4.99 | one-time |
| Add new sounds faster!!! | $9.99 | one-time |
| I'm rich | $100.00 | one-time |


### Engine Sounds

[App page](https://appshunter.io/ios/app/engine-sounds-superrev/id6770043689)

Experience authentic automotive audio with this simulator. Customize engine sound, throttle, RPM, and gear shifting for a realistic driving experience. Features a premium audio library and diverse engine architectures.

**Highlights:** Authentic automotive audio simulation, Real-time audio synthesis, 3D tuning simulator, Manual gear shifting, Customizable voice band curves, Premium audio library

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

**In-app purchases:** none


## Frequently asked questions

### Is Accel Synth free?

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

### Is Engine Sounds free?

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

### Do Accel Synth or Engine Sounds have ads?

Both Accel Synth and Engine Sounds show ads.

### Which is updated more often, Accel Synth or Engine Sounds?

Accel Synth ships an update every 3 days, and Engine Sounds every 4 months. Most recently, Accel Synth was updated on September 29, 2026 and Engine Sounds on October 12, 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.*