The fastest line for your kart, on any track. Then see exactly where your real lap loses time.
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Al Forsan International · Sodi RT8 EVO · ideal lap 1:10.124
Upload a map
Any top-down layout or photo. The AI reads the circuit, its direction and its real length.
Get the ideal lap
The fastest line your kart can hold, with every braking point, apex and exit.
Compare your lap
Drop in a GPS lap. See the corner, the metres, and the one thing to change.
ApexTrace AI does what a driver does on a track walk, then hands the circuit to a physics engine that solves every metre for your kart and your weight.
Any map
The AI reads the circuit from a photo, diagram or screenshot: its shape, start line, direction and every corner.
The real track
It looks up the circuit's real length and your kart's specs, from the web and the track's own site.
Your lap
The line and every lap time come from the physics engine. The AI reads and researches. It never invents a number.
The workspace you get when you sign in: the ideal line, linked telemetry, your lap against the ideal, and an audio track walk that calls every corner. Click anything.
16 corners (6 left, 10 right) · top 75 km/h · slowest 28 km/h at T6
Rental, Sodi, OTK or your own two-stroke. Change the kart and the line, every braking point and the lap time change with it.
In a rental kart, 10 kg is worth about two tenths a lap. Race Night takes weight — and the kart — out of your group’s results. Lap times only. Free.
Example group. On raw times it’s Sam, Alex, You. Weight effect simulated for Al Forsan in a 13 hp rental kart; Race Night works it out for your track and kart.
Never invented
Every number comes from the physics engine or from you. Published lap records are sourced, or not shown.
Checked against real maps
All 16 corners of Al Forsan and all 10 of Yas Marina read straight off their track maps, and a test suite keeps it that way.
Your laps stay yours
Never sold, never used for ads. Without an account they never leave your browser.
One track free, forever. Upgrade for every corner of every lap.
Free
Learn a new track before you drive it.
- 1 track
- 1 kart
- Ideal racing line, braking points and corner coaching
- Full lap telemetry
- Compare a real lap: your gap and your biggest loss
- Race Night: weight-fair results for your group
- Share cards
Every corner of your lap, your line on the map, the gap traceCalibrate the kart from your own lapsSession plans, and whether they workedAudio track walk with pace notesWas it you or the kart? Every rental kart scoredRace Night: separate drivers from karts across heatsUp to 5 driversExports: corner report, telemetry CSV, fly-through video
Plus
RecommendedFind your time, session after session.
- 3 tracks
- 2 karts
- Ideal racing line, braking points and corner coaching
- Full lap telemetry
- Compare a real lap: your gap and your biggest loss
- Race Night: weight-fair results for your group
- Share cards
- Every corner of your lap, your line on the map, the gap trace
- Calibrate the kart from your own laps
- Session plans, and whether they worked
- Audio track walk with pace notes
Was it you or the kart? Every rental kart scoredRace Night: separate drivers from karts across heatsUp to 5 driversExports: corner report, telemetry CSV, fly-through video
Pro
For rental racers, parents and coaches.
- Unlimited tracks
- Unlimited karts
- Ideal racing line, braking points and corner coaching
- Full lap telemetry
- Compare a real lap: your gap and your biggest loss
- Race Night: weight-fair results for your group
- Share cards
- Every corner of your lap, your line on the map, the gap trace
- Calibrate the kart from your own laps
- Session plans, and whether they worked
- Audio track walk with pace notes
- Was it you or the kart? Every rental kart scored
- Race Night: separate drivers from karts across heats
- Up to 5 drivers
- Exports: corner report, telemetry CSV, fly-through video
No. The ideal line, braking points, corner coaching and the audio track walk only need a track map and its length. Race Night only needs lap times from the timing screen. A GPS file is just for comparing your real lap. A phone app works, and a 10–25 Hz logger like a RaceBox is best.
Any closed circuit you can find a clear top-down map of: kart tracks and full-size circuits. Diagrams with the track in one colour on a plain background work best. Search “[track name] layout” and you'll usually find one.
It's a physics simulation of the fastest lap your kart could do. A target, not a promise. On Al Forsan it finds all 16 corners from the official map, and its 1:10.1 sits about 10% under a real 1:17.8 lap in the same kind of kart, which is where a theoretical best should be. If your laps prove the kart quicker, it recalibrates to them.
A leading large language model (currently OpenAI's) reads your track map (its shape, direction, start line and corners) and researches the track's real length and your kart's specs. The racing line and every lap time come from our own physics engine, so the AI never makes up a number.
GPX, VBO (RaceBox, VBOX) and CSV, from RaceChrono, Harry's LapTimer, AiM, Alfano, MyChron exports and most phone apps.
That's what it's best at. Race Night takes driver weight out of your group's results, and when karts are swapped between heats it scores every kart too, so you finally know whether it was you or the kart.
Yes. Without an account, everything stays in your browser. With one, your tracks and laps are saved to your account only. Never sold, never used for ads, and you can delete it all any time.
Yes. Cancel from Manage billing in a couple of clicks; you keep your plan until the end of the period you've paid for. Free stays free forever.
Upload a map and get your ideal lap. Free, on any track.