# OTOTETSU vs Mini4WD

The clearest difference is rating: OTOTETSU at 4.7 against Mini4WD's 4.0. OTOTETSU also leads on ads (none vs shown) and ratings volume (19 vs 1). Mini4WD's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OTOTETSU holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: OTOTETSU has 19 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 22, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | OTOTETSU | Mini4WD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (19 ratings)](https://appshunter.io/ios/app/ototetsu/id1557885726/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/mini4wd-laptimer/id1606492403/reviews) |
| Number of ratings | **19** | 1 |
| Positive reviews | 93.1% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 20 MB | 29 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hisato Takeuchi](https://appshunter.io/developer/1512764876) | [Katsuyoshi Konno](https://appshunter.io/developer/1606492405) |

## What reviewers say

### OTOTETSU

[App page](https://appshunter.io/ios/app/ototetsu/id1557885726)

This app simulates the characteristic sounds of electric trains, generated by inverters controlling motor torque and speed. Users can design sounds for imaginary trains by manipulating waveforms and motor sounds.

**Highlights:** Simulates electric train acceleration/deceleration sounds, Generates waveforms from inverters, Simulates motor sounds, Design imaginary train sounds, Customize torque and rotational speed effects

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

**In-app purchases:** none


### Mini4WD

[App page](https://appshunter.io/ios/app/mini4wd-laptimer/id1606492403)

This app uses your device's camera to automatically time Mini 4WD races. It can track lap times, fastest times, and average times, with manual measurement options available. Customize settings like passing sounds, vibration, and course length for an optimized racing experience.

**Highlights:** Automatic lap timing with camera detection, Manual measurement option, Records fastest and average times, Customizable passing sound and vibration, Adjustable number of lanes and laps, Course length setting for speed calculation, Share race results via Twitter, memo, or email

**In-app purchases:** none


## Frequently asked questions

### Is OTOTETSU free?

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

### Is Mini4WD free?

Mini4WD is free to download, with no in-app purchases.

### Which has better reviews, OTOTETSU or Mini4WD?

OTOTETSU is rated higher. OTOTETSU averages 4.7 out of 5 from 19 ratings, while Mini4WD averages 4.0 from 1 ratings.

### Do OTOTETSU or Mini4WD have ads?

Mini4WD shows ads; OTOTETSU does not.

### Which is updated more often, OTOTETSU or Mini4WD?

OTOTETSU ships an update every 2 months, and Mini4WD every 2 months. Most recently, OTOTETSU was updated on October 22, 2026 and Mini4WD on October 9, 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.*