# Trans4motor R vs Engine Lab

The clearest difference is price: Engine Lab at Free against Trans4motor R's $7.99. Trans4motor R's advantage is in-app purchases (none vs 1) and review sentiment (64% vs 50%). On rating, ratings volume, update cadence and ads there is nothing between them.

Engine Lab is free to download; Trans4motor R costs $7.99 up front. Engine Lab sells 1 one-off in-app purchase. Trans4motor R asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Trans4motor R against 4.8 for Engine Lab. Both are backed by a comparable volume of ratings — 11 and 16 respectively. Written reviews are what separate them: 64% of Trans4motor R's written reviews are positive against 50% of Engine Lab's.

Trans4motor R ships an update every 2 weeks, Engine Lab every 9 days. The most recent releases landed on November 8, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Trans4motor R | Engine Lab |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [4.6 (11 ratings)](https://appshunter.io/ios/app/trans4motor-r/id6739180076/reviews) | **[4.8 (16 ratings)](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979/reviews)** |
| Number of ratings | 11 | **16** |
| Positive reviews | **64.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 178 MB | 16 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | 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 R

[App page](https://appshunter.io/ios/app/trans4motor-r/id6739180076)

Explore and animate four-stroke engines with detailed customization options. Simulate transmissions, edit engine specifications, and experience realistic vehicle physics. Share your creations and learn about engine mechanics through interactive tutorials.

**Highlights:** Seamless engine morphing (inline to V, cylinder count, firing intervals), Full transmission visualization (3-shaft, 2-shaft, dog gearbox), Deep engine specification editing, Realistic vehicle physics simulation, Community sharing platform for engine designs, Interactive learning modes (TechTour), Enhanced, realistic engine sound simulation

**In-app purchases:** none


### Engine Lab

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

Design and simulate car engines, from single cylinders to V12s, and hear them run. Explore 3D models, test performance on a dyno, and even drive them with a simulated gearbox. Share your creations and compare them with others.

**Highlights:** Build custom engines, Hear engines idle and rev, 3D engine visualization, Simulated dyno testing, Manual/automatic gearbox simulation, Import and share engine builds

**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 R free?

Trans4motor R costs $7.99, with no in-app purchases.

### Is Engine Lab free?

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

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

Engine Lab is rated higher. Trans4motor R averages 4.6 out of 5 from 11 ratings, while Engine Lab averages 4.8 from 16 ratings.

### Do Trans4motor R or Engine Lab have ads?

Neither Trans4motor R nor Engine Lab shows ads.

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

Trans4motor R ships an update every 2 weeks, and Engine Lab every 9 days. Most recently, Trans4motor R was updated on November 8, 2026 and Engine Lab on November 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.*