Karting Lap Timer: Telemetry

Turn your iPhone into your kart's onboard computer. GPS lap timing, sector times, a comparison against your best lap and an analysis that tells you where the time went, with no hardware bolted to the wheel.

WHAT YOU SEE ON TRACK

A dashboard built to be read at a glance: current lap, best lap and the delta in green or red. No menus, no small print, nothing to tap while the kart is moving.

WHAT YOU FIND OUT AFTERWARDS

Lap analysis points at the three places where you lost the most time and tells you why for each one: you entered the corner slower, braked earlier, exited with less speed. It is not a number on a screen. It is the sentence that explains the number.

APPLE WATCH

Your watch shows the session on your wrist and taps the delta of every sector, so you know whether you gained or lost time without taking your eyes off the track. It also records your heart rate, shown per lap and per sector in the analysis.

AIRPODS

A spatial beep warns you before every corner, and the coach talks to you even with the screen locked. With compatible AirPods, the app measures where you look before each corner, because drivers who look early at the exit are faster.

APPLE HEALTH

Each session can be saved as a workout in the Health app, with time on track, calories estimated from your weight and the route. The app only reads your weight and only writes the workout, and only after you allow it.

WHAT THE APP MEASURES

• Lap times and sector times • Your racing line on the map, lap by lap • Speed and G forces • Steering angle estimated from the phone's sensors • Heart rate per lap, with Apple Watch • External 10 Hz Bluetooth GPS receivers, for extra precision

YOUR TRACK, ANYWHERE

Download the track catalog for your country. If your track is missing, add it in seconds by marking the finish line.

LEAGUES AND CHAMPIONSHIPS

Start a league with your friends or join one with a code. Rounds, season standings, teams and official results. You choose what to publish: no session goes to the league on its own.

Done with your heat? Share a session card with your racing line and best lap, or export to CSV and GPX.

YOUR DATA STAYS WITH YOU

Your racing line and telemetry stay on the device. Only what you publish goes to the cloud: your nickname, your number and the times you chose to show.

TRY IT BEFORE YOU HIT THE TRACK

Simulation mode runs the full dashboard with synthetic GPS, anywhere. The session is flagged and never mixes with your real times.

WHAT THIS APP IS NOT

Kart Coach is not official timing. A phone's GPS has a margin of error and times can differ from the track's transponder. For race results, the transponder always wins. This app exists to compare you with yourself: which lap was better, where you lost time and what changed when you changed your line.

SAFETY

Do not handle the phone while the kart is moving. Set up the session while stopped, in the pits. Many tracks and championships ban onboard devices: the track's rules matter more than this app.

Requirements: iPhone with iOS 17 or later. Apple Watch with watchOS 10 or later, optional. Support: kartcoach.app/support