Golf Swing Video Notebook

Three seconds of a swing, seen as a skeleton.

Film a golf swing or a baseball practice swing on your phone, and the joint movement is worked out inside this device, so the form can be kept as numbers.

The skeleton overlay, automatic detection of key moments and the measurements are available on iPhone and iPad. The only permission this app asks for is the camera.

• What it does
• Draws the skeleton (the joint positions) over the video you filmed
• Finds address, top, impact and finish on its own
• Shows shoulder rotation, pelvis rotation, forward lean, how far the head moved vertically, and how long the swing took, as measurements (it does not say whether any of that is good or bad)
• Pick one of your own past swings and overlay it, or set the two side by side
• A log by date, with the club or bat, a line of comment, and a favourite mark

• Who it is for

This is not a tool for feeling bad next to a model swing. It is a notebook for measuring your own change honestly against yourself last month, or last year. It works for a golf club and for a baseball bat.

• Privacy
• The analysis all happens inside this device, and nothing is ever sent to a server. The video, the pose data and the measurements stay on the device you use

Basic use is free. Only exporting your log as a CSV list is a one-time in-app purchase (a single payment of ¥200 in Japan, no subscription; the price is shown in the store). The app connects to the internet only to confirm a purchase, and your records are not sent anywhere.