OTOTETSU vs Mini4WD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OTOTETSU
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.
- Simulates electric train acceleration/deceleration sounds
- Generates waveforms from inverters
- Simulates motor sounds
- Design imaginary train sounds
- Customize torque and rotational speed effects
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When electric trains accelerate and decelerate, we can hear some characteristic sounds, which is caused by inverters' controlling the torque and the rotational speed of the motors. This app simulates the waveforms generated by inverters and sounds coming from motors, and you can also design sounds of imaginary trains.
Mini4WD
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.
- 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
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It is a timer application that can measure the lap time, fastest time, average time of Mini 4WD with the camera. Manual measurement is also possible. [How to use] 0. From the setting menu, you can set the passing sound, vibration, number of lanes, number of measurement laps, course length, detection sensitivity, unit, etc. 1. Select the number of lanes. If you are not sure, please select 1 lane. 2. Set the number of measurement laps. Measurement will end automatically at the specified number of times. 3. Set the course length. It is used for speed calculation. Even if it is not set, it does not affect the measurement. 4. Secure the device so that the selected lane and course match. Even if it deviates a little, there is no problem as long as it fits within the range where the Mini 4WD can pass. 5. Tap the screen and wait for the Mini 4WD to pass first. 6. Run the Mini 4WD. 7. When the specified number of measurements is taken, the measurement is completed. You can see records from the button at the bottom left. Records can be transferred to twitter, memo app, or email with the Share button. * Long Press to interrupt the measurement and return to the TOP screen. * Manual measurement is possible with the button at the bottom right. It can be used for simple measurement from outside the course. * Detection method The passage judgment of Mini 4WD is regarded as detection when the average brightness of the shooting frame pixels of the camera exceeds the set sensitivity. When the sensitivity is 85, it is detected that the average brightness before and after the frame changes by 15%, When the sensitivity is 90, it is detected that the average brightness before and after the frame changes by 10%, When the sensitivity is 60, it is detected when the average brightness before and after the frame changes by 40%. If you fix the device, the accuracy will increase. Even if the camera shakes without fixing, it will not be erroneously detected unless the brightness changes significantly.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | OTOTETSU | Mini4WD |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (19 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 93.1% of reviews | — |
| Number of ratings | 19 — better | 1 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Hisato Takeuchi | Katsuyoshi Konno |
Customer experience
OTOTETSU
Mini4WD
In-app purchases
OTOTETSU
No in-app purchases
Mini4WD
No in-app purchases
![ATOS接近放送[山手線]](https://cdn3.appshunter.io/i/Purple211/d19010e53546c58c2b003aa93f5e7dbf/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/640x0w.webp "ATOS接近放送[山手線]")
![ATOS接近放送[中央線]](https://cdn3.appshunter.io/i/Purple221/4996107af1896a2e5e535b631323dd51/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/640x0w.webp "ATOS接近放送[中央線]")
