Not guesses.
SWING DNA's recommendation engine has studied professional fitting methodology, verified equipment behaviour, and thousands of measured swing data points — so every prescription is traceable to evidence, never to a hunch.
It studied how fitters actually fit.
The engine encodes the complete professional testing sequence — lie before shaft, profile before weight, one variable at a time, winners confirmed by contrast. The same discipline a master fitter applies at the hitting bay, applied to your data.
It studied how equipment actually behaves.
Every shaft, head and grip in the bank carries structured behaviour classes — bend profiles, effective bounce, CG character, MOI — cross-referenced from fitting charts and current manufacturer lines, each with its source and verification status on record.
It studies how you actually swing.
Your videos are measured frame-by-frame: tempo, transition, delivery plane, turf interaction, hand height into impact. The AI reasons over measurements — it is never allowed to invent one.
Your swing videos and inputs become verified measurements with confidence scores.
Measurements run through the encoded fitting rules — delivery to bounce, tempo to profile, speed to weight.
Every product in the bank is scored against your profile; sources and concerns stay attached.
The AI reasoning layer writes the why — grounded only in your data and the studied knowledge.
The Studied Library
37 verified references power the engine — professional testing methodology, proprietary bounce prescriptions, current-market equipment behaviour and swing-research data. The library itself is proprietary to SWING DNA; what matters to you is what it does.
It fits in the right order, every time.
The library encodes the professional testing sequence — lie before shaft, profile before weight, grip last — with bracketing protocols that expose a player to both wrong answers before locking the right one. That discipline is why a SWING DNA prescription survives the hitting bay instead of dying there.
It knows what the sole, face and shaft actually do.
Effective bounce and camber govern how a club survives your turf. Zone-by-zone shaft stiffness — not marketing 'kick points' — governs delivered loft and face closure. CG depth trades launch against workability. Every product in the bank is indexed on these behaviours, so matching is physics, not brand preference.
It only recommends what you can actually buy.
The bank tracks every current line through the 2026 releases — drivers, iron heads, wedges, shafts from steel classics to thin-ply carbon, grips. Recommendations always land on real, orderable product with the spec flagged for final verification at build time.
It converts measurements into specifications.
Tempo ratios, transition force, hand-path planes, low-point behaviour, gear-effect strike maps: the library carries the research that translates what the camera measures into weight bands, bounce classes, loft windows and lie starting points — each with an honest confidence attached.
The Physics We Fit By
42 encoded principles distilled into the six ideas that decide most fittings.
Weight before flex.
Shaft mass sets how much force you can apply while staying in sequence — it correlates with dispersion more strongly than flex ever has. We converge on grams in ≤10g steps first; flex and profile then fine-tune delivery inside the right weight.
Bounce is forgiveness that works underground.
The sole is the only part of the club that touches the planet. Steep low points and soft turf demand effective bounce and camber so the head skips instead of digging; sweepers on tight lies need the leading edge kept low. MOI forgives the face — bounce forgives the ground.
Lie angle aims the loft.
Because the face is lofted, a lie error tilts the entire launch plane sideways — and the more loft, the bigger the miss, which is why wedges expose what long irons hide. Statics start the number; impact evidence on a lie board finishes it.
The transition chooses the handle.
Butt-section stiffness must match the force spike at the change of direction, not the speed at impact. A 90 mph swing with a violent transition loads a shaft harder than a silky 100 mph one — which is why we classify transition from video before assigning any flex letter.
Loft is a spin decision.
Launch and spin trade against each other through loft, CG and strike height. A low-spin head with more loft beats a spinny head with less almost every time — and the fit targets the strike pattern you actually own, because gear effect prices every off-center hit.
One variable. Then contrast.
Every test isolates a single change, and every winner must beat the deliberately-wrong alternative before it earns a place in the build. If a spec can't survive the A/B, it was noise — the engine and the testing order are both built around that standard.