# Trans4motor vs Engine Lab

The clearest difference is review sentiment: Trans4motor at 56% against Engine Lab's 0%. Trans4motor also leads on rating (3.7 vs 3.0) and ratings volume (70 vs 1). Engine Lab's advantage is price (Free vs $2.99) and update cadence (every 9 days vs every 2 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

Engine Lab is free to download; Trans4motor costs $2.99 up front. Trans4motor sells 1 one-off in-app purchase and Engine Lab sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Trans4motor holds the better App Store score, 3.7 against 3.0. That said, the two scores are not equally well evidenced: Trans4motor has 70 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 56% of Trans4motor's written reviews are positive against 0% of Engine Lab's.

Trans4motor ships an update every 2 months, Engine Lab every 9 days. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Trans4motor | Engine Lab |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.7 (70 ratings)](https://appshunter.io/ios/app/trans4motor-engine-simulator/id899277186/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979/reviews) |
| Number of ratings | **70** | 1 |
| Positive reviews | **56.1% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 24 MB | 12 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kitt Peak, Inc.](https://appshunter.io/developer/399507326) | [Jan Sokol](https://appshunter.io/developer/1896490456) |

## What reviewers say

### Trans4motor

[App page](https://appshunter.io/ios/app/trans4motor-engine-simulator/id899277186)

Explore the mechanics of 4-stroke engines with this interactive simulator. Visualize the transformation of various engine types and understand their internal workings through detailed CG animation. Enhance your knowledge with adjustable settings and realistic engine sound options.

**Highlights:** Multi-cylinder engine transformation, Realistic engine sound (in-app purchase), Accelerator control simulation, Expandable engine library, Custom engine registration and editing, Interactive educational videos

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add Engine Sound | $1.99 | one-time |


### Engine Lab

[App page](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979)

Explore engine mechanics with a touch-first simulator. Build, tune, and test custom engines, observing animations and hearing synthesized exhaust sounds. Export your creations as WAV files.

**Highlights:** Touch-first engine simulation, Build and save custom engines, Tune engine parameters, Simulated dyno pulls, Crank and piston animation, Native exhaust synthesis, Export WAV audio

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Engine Lab Pro | $4.99 | one-time |


## Frequently asked questions

### Is Trans4motor free?

Trans4motor costs $2.99, and also offers in-app purchases.

### Is Engine Lab free?

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

### Which has better reviews, Trans4motor or Engine Lab?

Trans4motor is rated higher. Trans4motor averages 3.7 out of 5 from 70 ratings, while Engine Lab averages 3.0 from 1 ratings.

### Do Trans4motor or Engine Lab have ads?

Neither Trans4motor nor Engine Lab shows ads.

### Which is updated more often, Trans4motor or Engine Lab?

Trans4motor ships an update every 2 months, and Engine Lab every 9 days. Most recently, Trans4motor was updated on October 15, 2026 and Engine Lab on October 10, 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.*