X-Factor analysis
Shoulder-hip separation at top of backswing. The single most predictive metric of driving distance.
Upload a single swing video. We extract 33 body landmarks, measure tempo, rotation, and X-factor — then a senior coach AI tells you exactly what to fix.
Side-on or face-on, any phone video. We accept mp4, mov, avi up to 200 MB.
MediaPipe tracks 33 body points per frame. We auto-detect address, top, impact, and finish.
Claude reads your tempo, rotation, X-factor, head stability — and tells you what to fix next.
Shoulder-hip separation at top of backswing. The single most predictive metric of driving distance.
Backswing-to-downswing timing. Tour pros average 3:1 — we measure yours to two decimals.
Address, top, impact, and finish detected automatically. No frame-by-frame work for you.
No jargon dump. You get 2-3 things you did well, 2-3 to fix, and what to practice next.
33 body landmarks per frame. Shoulder line, hip line, spine tilt, head stability — all quantified.
Runs locally on your machine. Your video never leaves your computer except to call the AI.
Your report will appear here.
No. GolfTrace runs locally on your computer. Only the numerical metrics (angles, timings) are sent to Anthropic to generate the coaching text.
A single analysis sends roughly 2-4 KB to the AI. With Claude Sonnet 4.6 that's typically a few cents per swing.
A side-on (down-the-line) or face-on view. Fixed camera. Whole body and club visible. 30 fps or higher. 3 to 10 seconds long. Phone in landscape at 1080p is ideal.
The prototype is tuned for full swings. Short-game motion uses a different scoring model and is on the roadmap.
The angle difference between your shoulder line and hip line at the top of the backswing. Bigger separation = more stored power. Amateurs average around 30°; tour pros 40-50°.