G-Box Lap Timer: Track Days

SEE WHERE YOUR LAP TIME GOES
Created by a professional racing driver and instructor. Mount your iPhone, drive your session and get every lap timed, onboard video with telemetry and a corner-by-corner breakdown: where you braked too late and where you lost speed on exit.

VIDEO WORTH SHARING
Record with iPhone cameras or connect a GoPro. G-Box overlays lap time, speed, G-forces, track map and RPM on your video. Pick a race-car style dash or a vertical layout for social media. On supported iPhones, film both cameras at once: the road and the driver.

ALL ON ONE IPHONE
25 Hz Fusion combines the iPhone's GPS and motion sensors to calculate a smooth driving line between GPS fixes, with no external receiver. These are calculated positions, not 25 Hz satellite measurements; results depend on GPS reception and phone mounting.
Add a compatible OBD adapter for RPM, estimated gear and power, or an external GPS receiver: G-Box, RaceBox Mini, Mini S and Micro, and selected Dragy models.

COMPARE YOUR LAPS
• Automatic lap timing, live delta, sectors and predicted lap time
• Speed, G-forces, RPM and delta on synchronized graphs and map
• Braking, turn-in, apex and exit speed against your best lap
• Friction Circle and a theoretical best lap from your strongest sectors
• Session replay on 2D and 3D maps

YOUR DATA, YOUR WAY
Import sessions from RaceChrono, Harry's LapTimer, VBOX, Race Navigator, MoTeC and AiM. Export to GBO, CSV, VBO, GPX and NMEA.

TRY IT BEFORE YOUR TRACK DAY
Open the included Nürburgring Nordschleife demo lap (8:06) to explore maps, graphs and lap timing before your first session.

YOUR FIRST TRACK DAY WITH PRO
Your first 3 sessions with laps are recorded with full G-Box Pro and stay unlocked for good: video, overlays, lap comparison and corner analysis. Sessions without laps don't count.

FREE AND PRO
Free: lap timing with iPhone GPS, map and speed graph, session import, OBD logging.
G-Box Pro: 25 Hz Fusion, video recording and overlays, lap comparison, all telemetry channels, corner analysis, OBD power and external GPS receivers. Choose a monthly or annual subscription (the annual plan starts with a free month for eligible new subscribers) or a one-time Lifetime purchase. AI analysis uses separate credits.

Location access is required for GPS lap timing. For closed race tracks only. Set up your phone before driving and never operate it while driving.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/