G-Box Lap Timer

Lap Timer & Driving Coach

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

G-Box Lap Timer is more than a stopwatch. It combines GPS lap timing, multi-source telemetry, synchronized video and driver coaching in one track-day tool. Record a fresh session or import a lap from another logger, then turn the data into decisions for your next stint. TIME EVERY STINT • Automatic GPS lap timing with current, previous and best lap • Live delta and sectors show where the lap is won or lost • Build or load your own circuits and organize every run • Choose metric or imperial units CONNECT THE HARDWARE YOU ALREADY OWN • Use iPhone GPS or a compatible external receiver over Bluetooth LE or Wi-Fi • Support includes G-Box, RaceBox Mini, Mini S and Micro, plus selected Dragy receivers • Read compatible OBD speed and RPM channels for richer telemetry and overlays BRING YOUR OWN TELEMETRY G-Box can analyze much more than sessions recorded inside the app. Import telemetry from RaceChrono, Harry’s LapTimer, VBOX, Race Navigator, MoTeC and AiM, plus GBO, CSV, VBO, GPX, KML and NMEA files. Load a lap from another system, select a reference and continue the analysis on your iPhone. SEE WHERE THE TIME WENT • Speed, longitudinal G, lateral G, RPM, delta and track position stay synchronized • Compare two laps on the same distance-based graph and map • Inspect braking zones, turn-in, apex speed, track-out and exit speed • Use the Friction Circle to see how effectively the available tire grip is being used • Build a theoretical best lap from the strongest parts of the session COACHING, NOT JUST CHARTS G-Box evaluates the driving behind the numbers. Corner-by-corner analysis looks at brake application, brake release, trail braking, rotation, apex and acceleration on exit. It turns telemetry into clear coaching points for a newcomer building consistency and an experienced driver hunting the final tenth. Optional AI analysis adds another independent reading of the telemetry. VIDEO THAT FOLLOWS THE LAP • Record with the iPhone cameras or connect a GoPro • Synchronize GoPro time, browse clips and import only the video you need • Match any video to any telemetry session by marking the lap start • Watch two laps side by side or stacked while the telemetry follows playback • Export a clean video overlay with lap time, speed, G-forces, track map, RPM and instrument layouts ONE TRACK-DAY WORKFLOW Keep sessions, laps, cars and tracks together. Compare runs, review the map and graphs, share eligible results to leaderboards and return to the next stint with a plan. 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 hardware, import, video, Pro and AI features depend on compatibility, subscription or credits. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

  • 5.0
    out of 5
    2 Ratings

• Improved route rendering with smoother continuous GPS+IMU paths for sessions recorded with iPhone sensors. • The GPS/GPS+IMU comparison is now shown only for iPhone GPS data; external GPS sessions use their recorded route directly. • Improved speed and telemetry graphs, calibration stability, and overall reliability.

Version 2.4

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
  • 46.6 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.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 3 more
  • English, French, German, Russian
Age Rating
4+
In-App Purchases
Yes
  • 2,500 AI Credits $24.99
  • 1,000 AI Credits $9.99
  • 500 AI Credits $4.99
  • G-Box Pro Lifetime $49.99
  • G-Box Pro Annual $29.99
  • G-Box Pro Monthly $4.99
  • Learn More
Copyright
  • © 2026 RACEMEASURE LLC
  • Developer Website
  • Privacy Policy

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