# Trans4motor vs 司書試験対策

The clearest difference is in-app purchases: 司書試験対策 at none against Trans4motor's 1. 司書試験対策 also leads on update cadence (monthly vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

Trans4motor ships an update every 2 months, 司書試験対策 monthly. The most recent releases landed on September 21, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Trans4motor | 司書試験対策 |
| --- | --- | --- |
| Price | **$2.99** | — |
| Rating | **[3.7 (70 ratings)](https://appshunter.io/ios/app/trans4motor-engine-simulator/id899277186/reviews)** | — |
| Number of ratings | **70** | — |
| Positive reviews | 56.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 24 MB | 34 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kitt Peak, Inc.](https://appshunter.io/developer/399507326) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## 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 |


### 司書試験対策

[App page](https://appshunter.io/ios/app/id6771861944)

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

**In-app purchases:** none


## Frequently asked questions

### Is Trans4motor free?

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

### Is 司書試験対策 free?

Pricing for 司書試験対策 is not currently listed on the App Store.

### Do Trans4motor or 司書試験対策 have ads?

Neither Trans4motor nor 司書試験対策 shows ads.

### Which is updated more often, Trans4motor or 司書試験対策?

Trans4motor ships an update every 2 months, and 司書試験対策 monthly. Most recently, Trans4motor was updated on September 21, 2026 and 司書試験対策 on September 8, 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.*