Mini4 Lap Timer is a free iPhone app developed by Ryuta Kibe, falling under the Lifestyle category with a focus on Sports. The app functions as a lap timer specifically designed for Mini4wd racing, utilizing the iPhone's camera.

Users can set the number of lanes to time and position their iPhone camera above the racing course to capture the Mini4wd as clearly as possible. By tapping the [I'm Ready!] button, the app automatically starts timing as the Mini4wd passes in front of the camera, providing an efficient and accurate way to track lap times for Mini4wd races.