33 points. 3 phases.
One clear picture of your swing.
Upload any swing video. AI maps your body and breaks down mechanics across setup, backswing, and impact. Your coach reviews the analysis — not the other way around.
How It Works
Record
Student records a swing on their phone (any angle).
Detect
AI detects 33 skeletal landmarks using pose estimation.
Calculate
Joint angles, sequencing, and positions calculated across 3 swing phases.
Review
Coach receives analysis in their review queue with original video side-by-side.
Prescribe
Coach adds their interpretation and prescribes next steps.
What AI Measures
Every swing generates a full mechanical profile. These are the key metrics your coach receives, calculated automatically from video alone.
Shoulder Turn
Measures rotation of the lead shoulder relative to the target line at the top of the backswing. Tour average sits between 85 and 95 degrees. Insufficient shoulder turn is one of the most common power leaks in amateur golfers, and most players overestimate how far they actually rotate.
Hip Rotation
Tracks pelvis rotation through setup, backswing, transition, and impact. The relationship between hip rotation speed and timing at the start of the downswing is a primary driver of clubhead speed. Stroke Gained measures both the degree of rotation and the rate of change through transition.
X-Factor & X-Factor Stretch
The differential between shoulder turn and hip turn at the top of the backswing, plus the additional stretch created during the early downswing. Research from the Titleist Performance Institute shows that X-Factor Stretch correlates more strongly with distance than X-Factor alone.
Shaft Lean at Impact
Measures the forward lean of the shaft at the moment of impact, expressed in degrees. Positive shaft lean compresses the ball, increases launch efficiency, and is a hallmark of consistent ball-striking. Stroke Gained calculates this by tracking the relationship between the lead wrist, club grip, and ball position frame by frame.
Tempo Ratio (3:1)
The ratio of backswing time to downswing time. Research by John Novosel found that nearly all professional golfers maintain a 3:1 tempo ratio regardless of their overall swing speed. A backswing that takes 0.75 seconds pairs with a downswing of 0.25 seconds. Stroke Gained measures this to the hundredth of a second.
Kinematic Sequence
Tracks the order and timing of energy transfer from lower body to torso to arms to club. The correct sequence fires hips first, then torso, then arms, then the club. When any segment fires out of order, energy leaks from the chain. Stroke Gained graphs each segment's angular velocity over time so your coach can see exactly where the sequence breaks down.
Who It’s For
For Players
- checkGet objective data on your swing without guessing what changed between lessons. Every session is measured the same way, so you can track real progress over weeks and months.
- checkRecord practice swings on your own and get the same 33-point analysis your coach uses. When you show up to your next lesson, your coach already knows what you have been working on.
- checkUnderstand the why behind your coach’s feedback. When they say your hips are stalling, Stroke Gained shows you the exact frame and angle where it happens.
For Coaches
- checkStop spending the first ten minutes of every lesson re-diagnosing the same positions. AI pre-analyzes every swing so you start each review with data, not a blank slate.
- checkTrack student progress across sessions with consistent measurements. No more relying on memory or handwritten notes to recall where a student was six weeks ago.
- checkScale your coaching practice by reviewing more students in less time. The analysis is done before you open the video, so your review time drops from fifteen minutes to five.
The AI doesn’t coach. It measures.
Your coach interprets the data, factors in your goals and tendencies, and decides what actually matters. That’s the difference between a tip and a plan.
Frequently Asked Questions
How does the 33-point analysis actually work?
When you upload a swing video, our AI runs pose estimation to identify 33 skeletal landmarks on your body, including joints, spine segments, and extremities. It tracks these points frame by frame through setup, backswing, transition, downswing, and follow-through. From those positions, the system calculates joint angles, rotation speeds, sequencing, and timing. The result is a complete mechanical breakdown without any wearable sensors or special equipment.
What camera angles and devices work best?
Any modern smartphone camera works. Face-on and down-the-line are the two standard angles used in golf instruction, and Stroke Gained supports both. For the most complete analysis, submit one video from each angle. The AI adapts to different filming distances and lighting conditions, though outdoor daylight and a clean background behind the golfer produce the most accurate landmark detection.
How accurate is AI swing analysis compared to in-person coaching?
The AI measures angles and positions with sub-degree precision, which is more consistent than the human eye. However, accuracy and usefulness are different things. A protractor can measure an angle perfectly, but it takes a coach to know which angle matters for your swing and your goals. That is why every Stroke Gained analysis goes through your coach before it reaches you. The AI handles measurement. Your coach handles meaning.
How does this compare to V1 Golf or Hudl Technique?
V1 and Hudl are video tools that let coaches manually draw lines and compare swings side by side. They are excellent for visual communication. Stroke Gained is different because the AI automatically measures every swing, meaning your coach receives a pre-analyzed breakdown before they even open the video. They spend less time drawing lines and more time interpreting what the numbers mean for your game. The two approaches are complementary, but Stroke Gained eliminates the manual measurement step entirely.
Does AI Swing Check replace my golf coach?
No, and it is designed not to. The AI measures your swing mechanics objectively, but it does not tell you what to change. Coaching requires understanding your goals, physical limitations, shot tendencies, mental game, and the specific changes that will produce the most improvement with the least disruption. Stroke Gained gives your coach better data, faster. It replaces guesswork, not coaching.
See AI Swing Check in action.
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