Start/Finish, Sectors, Delta
The app detects start/finish, stores sector splits, and shows live delta against the selected reference lap so drivers can see where the time is coming from.
G-Box Lap Timer · Built by a racing driver
Your iPhone.
25 Hz Fusion.
Record. Compare. Understand. Created by a professional racing driver and instructor, G-Box brings your laps, video and telemetry together on iPhone.
Coming in version 2.5 — awaiting App Store approval.
Free iPhone GPS Standard. Calculated 25 Hz GPS + IMU Fusion with G-Box Pro. No external GPS receiver required for Fusion.
G-Box Pro · GPS + motion sensors
See more of the line.
Understand more of the lap.
G-Box Pro Fusion combines the iPhone’s built-in GPS with its motion sensors (IMU) to calculate your driving line at 25 Hz. No external GPS receiver is required for this mode.
- Review an estimated trajectory between GPS fixes.
- Compare braking, corner speed, lap delta and acceleration on exit.
- Keep your video and available telemetry together.
- Bring supported recordings from the loggers you already use.
Version 2.5 preview · Pending App Store approval
25 Hz means calculated position updates, not 25 Hz satellite measurements or a guarantee of timing accuracy. Results depend on GPS reception, secure phone mounting and calibration.
In version 2.5, iPhone GPS Standard is free. Fusion and other advanced tools require G-Box Pro, available monthly, annually or as a lifetime purchase. AI analysis may require separate credits.
The driver behind G-Box
Built by a racer.
Made for your next track day.
G-Box was created by Denis Malevanyi, a professional racing driver and instructor. The aim is simple: turn a recorded session into something you can understand and use before your next stint.
From your first track day to your next race: record a session, compare laps, review braking and corner exit, then make a plan. G-Box is developed and operated by RACEMEASURE LLC in Florida, USA.
Legal entityRACEMEASURE LLC
Business address8380 NW 25TH CT, Sunrise, FL 33322, United States
Phone+1 954 459 3962
Your laps. Your video.
One app.
Keep the tools together, so you can spend your time understanding the drive. Use G-Box only on closed race tracks. Set up your phone before driving.
Optional G-Box Hardware · $199
Compact GPS lap timer, power meter and cockpit display in one track-day device.
G-Box is made for HPDE, track days and club racing. Its 25 Hz GPS measures lap times and builds smooth speed traces, while Bluetooth and Wi-Fi give you two simple ways to connect. It shows whether you are faster or slower than your best lap, estimates car power from acceleration, records your session, and sends the data to the G-Box app for overlays, leaderboards and AI coaching.
25 HzHigh-rate GPS
3.5 inTouch display
PowerAcceleration estimate
Automatic Lap TimingMeasures current, previous and best lap using track start/finish logic from the racing workflow.
Best-Lap Delta StripShows whether the driver is gaining or losing time compared with the best reference lap.
Custom TracksCreate and use your own circuits with start/finish markers and automatic nearby-track sorting.
Power EstimateAcceleration screens help estimate how the car pulls on straights and after corner exit.
Bluetooth + Wi-FiChoose a simple Bluetooth connection or Wi-Fi for the highest-rate live GPS and telemetry link.
App-Friendly SetupNo engineering workflow: pair the device, choose a track, drive, then review the laps.
Session RecordingKeeps the data needed for maps, graphs, overlays, AI review and leaderboard submission.
Dark Racing UIHigh-contrast lap timer and power screens are designed for quick cockpit reads.
Easy Connection
- Connect the device to the G-Box app over Bluetooth or Wi-Fi.
- Use 25 Hz GPS data for cleaner lap timing and smoother speed traces.
- Review each stint later with maps, graphs and video overlay.
- Share your best results to local or online leaderboards.
For Drivers
- Large lap timer for quick cockpit reads.
- Best-lap delta to show if the current lap is improving.
- Simple power and acceleration screens for straight-line comparison.
- Portable, battery-powered device for HPDE and track-day use.
Bring your laps. Keep your workflow.
Your driving history does not have to start over.
Import supported telemetry from RaceChrono, Harry’s LapTimer, VBOX, Race Navigator, MoTeC and AiM, then compare laps on your iPhone. Supported exports and available channels depend on the source system, file format and recording. G-Box also offers a browser viewer for compatible telemetry files.
GBO
VBO / TXT
RaceChrono RCZ
Harry's LapTimer HLPTRL / SQL
LapTimerGPSRecDB.csv
MoTeC LD / LDX
AiM DRK
Traqmate TQM / TQS
GPX / KML / GPS logs
Assetto Corsa / Simulator CSV
MP4 / MOV / M4V
Smart linked import
Select telemetry once and the app looks for matching laps, metadata, OBD logs, source sidecars and onboard video in the same folder.
Canonical GBO library
Every imported run becomes a normalized session with track name, driver, car, top speed, distance, laps, invalid-lap filters and source-file provenance.
Vendor-aware parsing
Traqmate TQM/TQS, MoTeC LD/LDX, AiM DRK, RaceChrono RCZ and Harry's LapTimer exports are parsed into the same Speed, Long G and Lat G model used by the native analysis screens.
Open CSV bridge
CSV exports from other loggers or simulator pipelines, including Assetto Corsa-style datasets, can be read when they include usable time, position, speed or G-force columns.
From Live Driving To Engineering Review
The app is organized around the way a track day actually works: record clean data, keep video aligned, clean up questionable laps, compare the right reference, then decide where time is being lost.
Race
Live lap timer with selected track, reference lap, start/finish detection, sector timing, delta bar, speed and G-force. Low-frequency GPS is handled with crossing interpolation so phone GPS and high-rate receivers can share the same lap logic.
Video and overlay
Back, front and dual-camera recording can be packaged with telemetry. Overlay jobs keep the same Speed/G/map layout and can be sent to the server composer for finished review videos.
Sessions
The library stores track, car, driver, tire, best lap, invalid laps and linked media. Sessions can be shared as an AILapSession package with manifest, telemetry and videos.
Analysis and AI
Analysis compares one or two laps, builds theoretical-best sector combinations, marks entry/apex/exit zones, and sends filtered telemetry to AI models such as Racing Instructor, Racing Engineer and F1 Engineer.
Record. Compare. Understand.
A look at G-Box 2.5, currently awaiting App Store approval. Tap a screen to explore it. Fusion and other advanced tools require G-Box Pro.
25 Hz iPhone Fusion
G-Box Pro 2.5 preview: a calculated GPS + IMU driving line. No external GPS receiver required.
See where your lap time goes
Compare braking, corner speed and delta on synchronized maps and graphs.
Record your next stint
Track current, previous and best lap, with live timing and available telemetry in one view.
Understand the corner
Review how braking, rotation and acceleration change from one lap to another.
Your video. Your telemetry.
Link video to your session and review your driving alongside the data.
Replay the session
Follow your recorded driving line and review the lap on the map.
Keep your laps together
Organize sessions and return to the recordings you want to compare.
What G-Box Actually Does
Under the simple cockpit UI, G-Box handles the hard work: GPS timing, video sync, lap cleanup, class rankings and AI-ready session summaries.
Phone GPS, G-Box, RaceBox, VBOX, OBD
The app can use the phone, G-Box hardware, popular external GPS devices and available OBD data, then turns everything into the same lap map, speed trace and G-force review.
Onboard Video And Overlay
Back/front/dual camera recording is tied to the session clock. The exported package can carry raw videos, overlay videos, picture-in-picture output and telemetry for server-side composition.
Cleanup, Rankings, AI Evidence
Drivers can delete invalid laps, compare all laps from selected sessions, build theoretical best sectors, estimate GT class by power-to-weight, and send compact or full telemetry to AI analysis.
Leaderboards
Turn every HPDE session into a clean class ranking.
G-Box finds the best valid lap for each driver and car, groups results by track and class, and lets clubs or friends compare local and online results without spreadsheet work after a track day.
Best lap per participant
The app keeps one clean best result per driver/car combination, so a leaderboard stays readable instead of filling with duplicate laps.
Track-day classes
Overall, GT1, GT2, GT3 and GT4 filters make mixed HPDE groups easier to compare by pace and estimated power-to-weight.
Local first, online when ready
Review results privately on the phone, then send the leaderboard when the event or run group is ready to share.
TrackRoad Atlanta
Leader01:37.450
SourceLocal
Leaderboards
3 sessions processed · 2 best results
#1
Denis MalevanyiM3 · GT2 · 220 hp/t
01:37.450Best lap
#2
EricM3 · GT2 · 210 hp/t
01:40.950+3.500
The Web Viewer Mirrors Analysis
Telemetry exported from G-Box opens directly on the site. The browser viewer is not a separate toy: it follows the native analysis model with lap rebuilding, track map, playback cursor, Speed/Long G/Lat G graph and imported-file metadata.
Opens Real Track-Day Exports
Use the demo file, upload your own telemetry, or open session links generated from the library. VBO, CSV and normalized GBO data all land in the same review layout.
Track Line And Cursor
The route is colored by speed, start/finish is inferred like in the app, and the viewer keeps S/F, S2 and S3 layouts per track for repeat analysis.
Three Analysis Channels
Speed, Long G and Lat G can be toggled, zoomed and synchronized with the map, so a braking or exit mistake is visible as both a line on the circuit and a trace on the graph.
A Complete Data Loop, Not A Stopwatch
G-Box records, imports, normalizes and explains track data. The goal is to make every stint useful: the same session can become a local leaderboard entry, a browser viewer link, an overlay video and an AI coaching request.
Local-first session archive
Telemetry, laps, videos, metadata and invalid-lap decisions stay on the device first, then can be shared as a package or uploaded when needed.
Overlay and sharing pipeline
The session package includes manifest data, source file names and linked media so overlay rendering and later review remain traceable.
Native analysis in the browser
The site viewer opens telemetry, rebuilds laps and makes analysis shareable in a browser, without requiring the recipient to install the iPhone app.
Your next stint starts with a better debrief.
Get G-Box for iPhone, explore a demo in the web viewer, or bring a supported recording from your existing logger. Fusion 25 Hz arrives with G-Box Pro 2.5, currently awaiting App Store approval.