Developer Builds iPhone Tennis Coach with AI Tracking

AA posted that he built a model tracking ball speed, forehand versus backhand strokes, shot placement, and body position at contact. The input is iPhone video fed through a pipeline that labels data with Astra 6 and detects objects with a fine-tuned model. Several replies offered feedback on additional metrics such as distance to the ball at impact, early positioning, balance, and footwork. One reply stated the author downloaded the video, generated another app with ChatGPT, and submitted it for App Store review.