# Mini4WD-LapTimer — Lap timer for Mini-4WD Racer

> Camera-based lap timer for Mini 4WD racing with customizable settings. (iPhone/iPad app by Katsuyoshi Konno.)

- Source: https://appshunter.io/ios/app/mini4wd-laptimer/id1606492403 (this page in markdown: same URL + `.md`)
- Developer: [Katsuyoshi Konno](https://appshunter.io/developer/1606492405)
- Category: Entertainment, Utilities
- Price: Free
- Rating: 4.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 13.0 · 29 MB
- Languages: English, Japanese
- Released: 2022-01-25
- Data updated: 2026-06-01
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/mini4wd-laptimer/id1606492403/reviews.md

## What is Mini4WD?

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.

## Key features

- 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


## Frequently asked questions about Mini4WD

### Does Mini4WD-LapTimer have ads?

Yes, Mini4WD-LapTimer contains advertisements. This allows the app to be offered for free to users.

### What devices does Mini4WD-LapTimer support?

Mini4WD-LapTimer is available on iPhone, iPad, and iPod. It is designed for Apple's mobile operating system.

### What is the age rating for Mini4WD-LapTimer?

Mini4WD-LapTimer has an age rating of 4+. This indicates it is suitable for children and general audiences.

### How accurate is the camera detection in Mini4WD-LapTimer?

Accuracy increases with a fixed device. Detection is based on the average brightness of camera pixels exceeding set sensitivity levels. For example, a sensitivity of 85 detects a 15% brightness change.

### Can I manually time races with Mini4WD-LapTimer?

Yes, manual measurement is possible using a dedicated button at the bottom right of the screen. This is useful for simple timing outside the main course.

### How often is Mini4WD-LapTimer updated?

The app was last updated on September 1, 2025, with version 1.0.10. This suggests regular updates to improve functionality and address issues.

### What settings can I customize in Mini4WD-LapTimer?

You can customize the passing sound, vibration, number of lanes, number of measurement laps, course length, detection sensitivity, and units from the settings menu.

### How do I share my race results from Mini4WD-LapTimer?

Race records can be shared using the Share button. You can transfer your results to Twitter, memo apps, or email.

## Version history (last 5 releases)

### 1.0.10 — 2025-09-01

Added an option to prevent the screen from automatically locking.

### 1.0.9 — 2025-03-14

The course length can now be entered directly as a numeric value.

### 1.0.8 — 2025-02-24

The number of measurable laps has been increased from 20 to 200.

### 1.0.7 — 2023-08-21

internal library updates, ad updates

### 1.0.6 — 2022-03-28

・ Improved camera performance
・ Minor bug fixes
・ Maintenance of advertising function

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## Related topics

[laptimes](https://appshunter.io/ios/topics/laptimes) · [mini 4wd](https://appshunter.io/ios/topics/mini-4wd)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*