Track-day telemetry, forged simple

Forge
faster laps.

LapSmith turns your phone into a race engineer. Live timing on track, corner-by-corner audio coaching against your own best lap, and broadcast-style video overlays - synced automatically from GPS, engine and camera data.

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LapSmith is in testing. Join iOS on TestFlight, or leave your email for Android test access and launch updates.

  • 25HzGPS telemetry
  • ±0.01spredictive lap timing
  • 4+devices, one app
Live session screen showing lap timer, delta and telemetry

What's in the toolbox

Everything between you
and your next personal best

Live telemetry & predictive timing

Lap time, delta to your best, predicted lap and speed - live on your phone, big enough to read at 120 mph.

Session analysis & lap compare

Scrub through every lap, overlay speed and braking traces against your best, and see exactly where the time went.

Video overlays, auto-synced

LapSmith matches your camera footage - imported over Wi-Fi or USB - to GPS and engine data automatically, then exports broadcast-style overlay videos ready to share.

Two cameras, mixed and matched

Control up to two action cameras at once - GoPro and DJI Osmo, in any mix - and add your phone's front and rear cameras for up to four angles on every lap.

AI coach for your next session

After each session, LapSmith reviews your laps, surfaces the biggest gains, and gives you specific things to work on next time out.

Your whole rig, one app

RaceBox and Dragy GPS, OBD engine data, GoPro and DJI cameras, and heart-rate sensors connect side by side - with clear status for every device before you roll out.

Hands-free, gloves on

Start a session with Siri or the iPhone Action Button - Google Assistant on Android - then LapSmith arms itself and starts recording the moment you're up to speed.

CarPlay on the dash

Lap time, delta and session status on your car's own screen - phone mounted or pocketed, eyes where they belong.

Bring your history

Coming from another app? Import your existing laps from RaceChrono, TrackAddict, Harry's LapTimer, VBOX, AiM and GPX files, and analyze them right alongside your LapSmith sessions.

Race procedure

Three steps to the grid

  1. 01

    Connect your gear

    Pair your RaceBox, OBD adapter and GoPro once. LapSmith remembers your rig and checks it's ready before every session.

  2. 02

    Drive

    Start hands-free with Siri or the Action Button - or just drive. Laps detect automatically at the start-finish line, recording arms itself and rolls up to speed, with live timing on screen and coaching in your ears.

  3. 03

    Review, coach, share

    Compare laps corner by corner, find the time, and export overlay videos that look like they came off a race broadcast.

On the dash

Timing where your
eyes already are

With CarPlay, LapSmith puts lap time, predicted lap, delta and data quality on your car's built-in display. No suction mounts, no glancing down - just the numbers that matter, at a glance.

LapSmith live session on a CarPlay display showing lap time, predicted lap, delta and speed

In the garage

Bring your whole rig

LapSmith works with the track-day hardware you already own - or nothing but the phone in your pocket. Pair each device once and LapSmith checks it's ready before you roll out.

GPS & motion

  • Phone GPS Built-in No extra hardware - record laps with your phone's own GPS and motion sensors.
  • RaceBox Mini 25Hz · BLE External 25 Hz GPS and IMU over Bluetooth LE.
  • RaceBox Mini S 25Hz · BLE 25 Hz GPS and IMU with standalone recording hardware.
  • Dragy 25Hz · BLE Dragy performance GPS meters (Lite, GPS and Pro) at up to 25 Hz over Bluetooth LE.

Engine data (OBD-II)

  • Generic ELM327 BLE / Classic Any standard ELM327-compatible OBD-II adapter, over Bluetooth Classic or LE.
  • OBDLink MX+ Classic Fast, reliable Bluetooth Classic OBD reader.
  • VeePeak OBDCheck BLE+ BLE Low-energy Bluetooth OBD adapter for iOS and Android.

Action cameras

  • GoPro · Open GoPro BLE · Wi-Fi · USB HERO9-HERO13 Black, HERO11 Black Mini, MAX 2 and LIT HERO. Controlled over Bluetooth; footage imported over Wi-Fi or USB for auto-synced overlays.
  • DJI Osmo Action BLE · USB Osmo Action 4 and newer. Controlled over Bluetooth - LapSmith starts and stops recording automatically; import the footage afterwards for overlays.

Heart rate

  • Bluetooth LE monitors BLE Any standard Bluetooth LE heart-rate strap or monitor - no specific brand required.
  • Apple Watch watchOS Stream live heart rate from a paired Apple Watch on iPhone. LapSmith uses a temporary Watch workout and discards it when the session ends - install the LapSmith Watch app first.

Bluetooth devices pair on iOS and Android, and you can mix GoPro and DJI action cameras with your phone's own - up to four cameras in a single session. GoPro footage imports over Wi-Fi or USB while LapSmith stays open; update your camera firmware before first pairing.

Session analysis on a tablet: insights and laps side by side

On the big screen

Room to read the
whole lap

LapSmith is a universal app - it runs natively on iPad and Android tablets, in any orientation. On a bigger screen the session browser, analysis workspace and live dashboard reflow into multi-pane layouts, so your laps, map, traces and insights sit side by side instead of a swipe away.

  • Native iPad & Android tablet app
  • Multi-pane session analysis & live dashboard
  • Portrait or landscape - your call

Testing now on iOS and Android

Join iOS testing through TestFlight, or leave your email for Android test access and launch updates.

Testing builds may change quickly; your feedback helps shape the launch.