G-Box Lap Timer

Built for track days, HPDE, open lapping and time attack: chase the next tenth with live delta, braking zones, apex speed, exit speed and tire grip.

G-Box Lap Timer turns your iPhone into a GPS lap timer, telemetry logger and driving coach for track days, HPDE, open lapping and time attack.

CHASE THE NEXT TENTH • Automatic GPS timing for every stint • Current lap, last lap and personal best always in view • Sectors and live delta show exactly where the lap is won or lost • Load your own circuits and keep every session organized

READ THE HOT LAP, NOT JUST THE STOPWATCH • Speed, longitudinal G and lateral G synchronized with your position on track • Telemetry traces for the braking zone, turn-in, apex and track-out • Scrub through the full lap in a clear full-screen graph • Friction Circle shows how completely you are using the available tire grip

BREAK DOWN EVERY CORNER • Compare the selected lap with the strongest lap of the session • Review braking points, brake release and trail braking • Spot too much entry speed, a missed apex or exit speed left on the table • Find where you can roll into the throttle earlier and unwind the wheel sooner

YOUR TRACK-DAY TOOLKIT • Manage sessions, laps and vehicle data • Record onboard video with a clean telemetry overlay • Compare lap times by vehicle class and power-to-weight • Use compatible external GPS and OBD data sources

G-Box is built for drivers who want more than a lap time after the checkered flag. It helps show where the next tenth is still hiding.

Location access is required for lap timing and telemetry. Use G-Box only on a closed race track and never operate the phone while driving. Some advanced features may be limited.