Where your tenths are hiding.
Your lap timer already recorded everything: where you brake, where you hesitate, where the same corner costs you a different amount every lap. TENTHS reads that data the way a race engineer would — measured against physics, not vibes — and debriefs you like a pro team debriefs a rider.
Analysis runs in your browser; your data stays on your device. The debrief is narrated by a frontier AI model and every number is machine-verified against your own data before you see it.
Analyze a session — free How it works
RACEBOX CSV · VBO (RACECHRONO / VBOX) · 19 US TRACKS WITH PHYSICS REFERENCE · ANY TRACK IN SELF-MODE
Charts tell you what happened. A debrief tells you what to change.
Aviation figured this out decades ago: flight data plus a structured post-flight debrief is how pilots improve. TENTHS applies the same discipline to track riding — your session is measured, scored, and turned into three prioritized items with a drill for each.
Can you ride the same lap twice? Segment-time spread, corner by corner.
Do you carry the same speed through fast corners every lap — or only when it feels right?
Does your brake point live in one place, or wander metres lap to lap?
Example scores from a real analyzed session. Free — no account, no upload.
The AI never decides a number. It explains numbers physics decided.
Deterministic engine
Corners, speeds, spreads, and scores are computed by code in your browser — the same math every time. On 19 US tracks, your line is compared against a minimum-time reference solved from track geometry and tire physics.
Machine-verified narration
Before a debrief reaches you, every number in it is checked against your data. A debrief that fails verification is regenerated, not shown. The check result ships with your debrief.
Estimates labeled as estimates
Reference figures are physics-simulation estimates under stated assumptions — warm tires, dry track — not lap records. Lean angle is derived from GPS, not a sensor. The debrief says so.
Analysis is free. The debrief is $12.
The cheapest human data review costs over $100 a session. A trackside data coach is several hundred. TENTHS reads the same channels — line, brake points, corner speeds, consistency — for about what you spend on one set of tire warmers' electricity.