Lap Timer for Mini 4WD, Slot Cars

Contains ads
556 reviews
Content rating
Screenshot image
Screenshot image
Screenshot image

About this app

Keep track of Mini4WD and slot cars lap times using your phone camera.

Easy to use:
✅ Place the phone alongside the track, with the red line on the camera preview facing on a track lane.
✅ Press calibrate: the app will calibrate in a couple seconds.
✅ Press start and put your car on the track.
✅ The app will record your lap times as the car passes under the red line.
❌ Do not cast shadows on the track or measuring will be wrong.
❌ Do not move the phone or you will have to recalibrate.

Can also be used with slot cars or for other purposes.
You can export the lap list as CSV (for import in Excel) or send it directly via email.

🔆Please use the app in a well lit environment. The app uses differences in shadow to detect the passing car. Other moving things that cast shadows on the track will interfere with time recording.
Good lighting also improves camera framerate so times will be more precise.
🚗 If the car is too fast and doesn't get recorded, try to place your phone at the end of a slow part of your track.


Internet permission required for ad banners. This app is ad-supported.

Mini4WD is a trademark of Tamiya, inc.
For more precise timing, please purchase the original Tamiya (#15184) Lap Timer.
Updated on
Aug 31, 2014

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
No information available
556 reviews
Daniel Place
October 30, 2021
Constantly registers a shadow as a lap time every time.
1 person found this review helpful
Did you find this helpful?
Anna# Aiyra Khansa Hinata
December 1, 2021
Is good in app
2 people found this review helpful
Did you find this helpful?
Chris Huang
August 27, 2020
Doesn't work
2 people found this review helpful
Did you find this helpful?

What's new

Japanese language added. (please email me for errors!)
Complete lap list on screen.
Export lap list as CSV.