Your $200/hr coach uses this data.
Now your AI does too.
Every Stroke Gained analysis is grounded in published biomechanics research. We don’t guess what’s wrong with your swing — we measure against the same benchmarks tour coaches and fitters rely on.
Most AI swing apps just describe what they see.
“Your backswing looks short.” Compared to what? “Your hips aren’t clearing.” How much is enough? Without real benchmarks, AI feedback is just expensive guessing. We built Stroke Gained differently.
Powered by 6 research sources
The same data used by PGA Tour coaches, club fitters, and biomechanics labs.
TPI
Titleist Performance Institute
Body-swing connection framework used by 30,000+ certified professionals worldwide. Their Big 12 swing characteristics define the measurable faults we screen for.
- checkShoulder turn benchmarks
- checkHip rotation ranges
- checkX-factor differential
- check12 defined swing faults with prevalence data
TrackMan
TrackMan 2024 PGA Tour Averages
The gold standard in launch monitor data, used on every professional tour worldwide. We compare your numbers against their latest PGA Tour averages.
- checkAttack angle by club (-1.3 driver to -5.0 PW)
- checkClub speed and ball speed benchmarks
- checkClub path and face angle norms
- checkCarry distance references
HackMotion
HackMotion Wrist Sensor Data
Wrist angle data used by top 100 coaches worldwide. Their research quantifies shaft lean and wrist position at every phase of the swing.
- checkShaft lean at impact: neutral driver, 6-12 irons, 10-15 wedges
- checkLead wrist flexion at top of backswing
- checkRadial deviation benchmarks
Kinematic Sequence
TPI / Phil Cheetham Research
Published research on the proper firing order of the body during the downswing. The same data that K-Vest and Gears 3D systems use to evaluate sequencing.
- checkPelvis, thorax, arms, club firing order
- checkPelvis peak velocity: 490-760/s (tour)
- checkSequence break detection
Tour Tempo
Novosel (2004) + Yale University (2006)
John Novosel discovered the 3:1 tempo ratio by analyzing tour pros frame-by-frame. Yale biomechanics researchers independently confirmed it using a biomechanical clock model.
- check3:1 backswing-to-downswing ratio
- check21:7 frame count at 30fps
- checkPeer-reviewed confirmation (Grober & Cholewicki)
Strokes Gained
Mark Broadie, Columbia University
The framework that changed how golf performance is measured. We use strokes-gained thinking to prioritize which part of your swing to fix first based on scoring impact.
- checkLong game accounts for 2/3 of scoring gaps
- checkApproach shots are the #1 differentiator
- checkFix what costs the most strokes first
We know what to look for — and how common it is.
TPI’s research shows these are the most common swing faults among amateur golfers. We screen for all of them — but only flag what we can actually see in your video.
Early Extension
64% of amateursHips move toward the ball from address to impact
Loss of Posture
54% of amateursSignificant change in spine angle during the swing
Over the Top
43% of amateursClub path moves outside target line in early downswing
Casting
40% of amateursWrist angles release before hands reach hip height
Sway
35% of amateursLateral hip movement past trail foot in backswing
Slide
30% of amateursLateral hip movement past lead foot in downswing
Chicken Wing
30% of amateursLead elbow bends post-impact instead of extending
What happens when you upload a swing
Video analysis
AI watches your swing frame-by-frame, tracking body positions through all 6 phases: address, backswing, transition, downswing, impact, and follow-through.
Benchmark comparison
Every measurement is compared against research-backed benchmarks. Your shoulder turn against TPI data. Your shaft lean against HackMotion ranges. Your tempo against the Novosel 3:1 ratio.
Fault screening
We screen for all 12 TPI-defined swing characteristics. But we only flag faults we can visually confirm in your video with specific evidence. No guessing.
Priority ranking
Using strokes-gained thinking, we identify the single change that will have the biggest impact on your scores. Fix the biggest leak first.
Skill-adjusted coaching
A 20-handicap doesn't need tour-level numbers. We adjust expectations to your level and give you drills you can actually do at the range today.
If your swing is good, we’ll tell you.
Most apps invent problems to justify the analysis. We don’t. If your mechanics are fundamentally sound, we acknowledge what’s working and give you maintenance drills to stay sharp — not corrective fixes you don’t need.
Ready for analysis you can trust?
Upload your first swing and see the difference research makes.