Why SwingLoop exists
Golfers have carried excellent slow-motion cameras in their pockets for years. The awkward part is the review loop: set the phone behind the hitting line, make a swing, walk back, find the clip, and rebuild the setup for the next ball.
SwingLoop gives the two devices different jobs. One stays fixed as the camera. The other stays close as the replay screen. Automatic detection and direct device-to-device transfer connect those two jobs without an account or a cloud swing library.
The result is deliberately narrow: see the swing while the feel is fresh, make one decision, and hit the next ball.