“Everyone builds a coach that talks. The hard problem is knowing when it should shut up.”
Lapmetry's coach is a silence system first. Only then is it a coach — one that works in four beats and gives a reason for every sentence.
Quiet zones: where nobody speaks.
Lapmetry recognises the hard passages of your lap from your own pedal work — from first braking to full throttle, plus a run-up before it. Sentences stay silent there. Signals like the brake countdown deliberately run into them: its target is the brake point.
The minimum length of a zone grows with the track (50–175 m); gaps without a real speaking window merge; no zone runs across start/finish. A deferred call expires — after six seconds or at the start of the zone.
Four beats, one rule.
Nothing moves from a beat with plenty of capacity into one with little. What you cannot process while driving waits for the line — or for the pits.
Beat 1 — In the corner of your eye
The ghost gets a place: a second dot on the map, plus the gap in metres — not in tenths, because metres can be found again at the next brake marker. The outline takes its colour from the last completed lap: it changes once per lap and therefore never flickers.
Real product window · demo telemetryEvery finding carries its why.
The corner analysis never just says what was wrong. Every finding comes with three sentences: the measurement, the action — and the reason. All three are computed deterministically from your telemetry; no language model guesses along.
17 corner findings from “brake point too early” to “exit width unused”, plus six race findings (traffic, tyre wear, pit-stop spread, start).
Braked too early — 18 m before the reference point.
Do this: Push the brake point back metre by metre — the reference carries it as a bar across the track.
Why: “Every meter braked too early is a meter of full throttle that never happens — deceleration starts before it has to, and the braking zone turns into a crawl.”
Reference is a choice — with named provenance.
One reference applies to everything at once: ghost, call, confirmation, line. You choose where there is capacity — never in a window while driving. And time and line always come from the same lap.
Automatic
The level just above your pace. Not the alien — a reference that pulls away stops telling you anything.
Provenance: 24 drivers · 310 laps
Applies to ghost, call, confirmation and line at once. A change takes effect with the next lap, not in the middle of the current one.
Community references are built from five drivers and thirty laps per combination — the median over the percentile-nearest laps of different drivers. A reference that does not say how many laps it is built from is a claim. That is why the data basis is always stated.
Brake-point drill T7
In at least 8 laps: braking in T7 starts no more than 5 m from the reference. Only what the telemetry proves counts.
One corner per week. Measured.
The training plan sets one focus each week — the corner where most of the time is. With it comes a drill with a frozen target: brake point, pressure build-up, apex speed, exit, line, consistency or race pace.
- A drill only counts as done once the telemetry proves it — no ticking your own box
- Done → consolidation drill + new focus. Not done → repeat with a relaxed tolerance
- The target travels into the cockpit: beat 2 confirms live against exactly this number
Five axes, from measurements.
Braking · mid-corner · exits · line · consistency — per combination, from your corner metrics against the reference. Below ten measurements an axis shows nothing instead of a guessed number. The dashed shadow: where you stood seven days ago.
After every corner: its trace.
Speed, brake and throttle stacked — your trace solid, the reference dashed, with marks for braking and full throttle. Three numbers below: brake point in metres, apex in km/h, throttle point in metres.
Claude narrates. Never decides.
On request a race engineer sums up the session — four paragraphs: what was good, the biggest building site and why it costs time, the one drill, the outlook. Then you can ask follow-ups.
- Works exclusively with your computed analysis data — invents nothing, rounds nothing into shape
- If the data does not answer a question, it says so instead of guessing
- 20 questions per day; every analysis is computed once and then remembered
Still switched off in the beta — the deterministic analysis is the full coach.
Answers rest exclusively on your analysis data — the coach does not guess.
What this coach never does.
Three promises the market makes — and we refuse, because they cost trust.
No “+0.4 s in turn 3”
Per-corner time-gain promises add up to lap times nobody drives. Our lap balance is made of segments that by construction sum exactly to the lap delta — not to a wish.
No predicted lap time
Twelve metres of measurement offset already produce 0.3 s of phantom error — four times that in slow corners. A prediction standing on that is decoration. We show what was measured.
No delta in the race
In a race your head belongs on the traffic, not on a comparison number against an empty track. The coach shuts up in the race — the balance comes afterwards.