Case study · 05
An AI golf coach from one video
Films a swing and measures tempo, plane, and posture - then tells you the one thing to work on next.
05
I built SwingStar for myself - I'd just earned my golf licence and wanted to actually learn to strike the ball, so instead of a season of lessons I built a coach. Upload a clip from your phone and, in seconds, pose tracking traces your body through every frame while an AI coach reads the motion across the key positions - setup, top, impact, finish.
It scores the swing out of 100 and gives you the numbers a lesson rarely does - tempo ratio, swing speed, swing plane - then turns them into a staged plan: the single thing to fix first, with drills, before you move on. It even estimates ball flight and flags pose-detected faults by severity. A small, personal example of a bigger point: when building is this cheap, you can make the exact tool you wish existed.
From one clip to a scored report
The improvement plan
Component map
SwingStarsystem
Capture
- Upload a clip
- Key positions · setup · top · impact · finish
Analysis
- Pose tracking · BlazePose
- 33 body points / frame
- LLM vision
Report
- Swing rating · /100
- Tempo · speed · plane
- Swing trajectory
- Ball-flight estimate
- Pose-detected faults
Coaching
- Staged improvement plan
- Drills per stage
- Phase breakdown
Stack
Pose trackingMediaPipe Pose Landmarker (BlazePose) - 33 body points traced per frame
LLM visionreads the frames for the form cues raw joint angles miss
AI coachscores the swing, writes the staged plan and drills, estimates ball flight
Want one built for your business?
These are my own builds. Yours would be shaped to your exact workflow - and you'd own it outright.