G-Box Lap Timer

Lap Timer & Driving Coach

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

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.

Ratings & Reviews

  • 5.0
    out of 5
    2 Ratings

• Sharper telemetry charts and a full-screen graph for the post-stint data debrief. • Added Friction Circle to show how completely the available tire grip is being used. • Refined corner analysis, track maps and session handling. • Added German, French and Russian localization. • Fixed bugs and improved stability.

Version 1.1

The developer, RaceMeasure LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Contact Info
    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • RaceMeasure LLC
Size
  • 42.8 MB
Category
  • Sports
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • Mac
    Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
Languages
English and 3 more
  • English, French, German, Russian
Age Rating
4+
Copyright
  • © 2026 RACEMEASURE LLC
  • Developer Website
  • Privacy Policy