SwingKey is in beta — download it for Mac

There’s a new app: SwingKey, for the Mac.

It started with a video. It had been about a year since the last one, and the useful part of filming a swing is the ten P-System checkpoints — address, shaft parallel, lead arm parallel, the top, impact, and on through the finish. Getting them means scrubbing a 120-frames-per-second video and eyeballing timestamps, ten times.

SwingKey does it in one pass. Drop in a clip and it finds all ten, then exports them as full-resolution stills and a labelled contact sheet you can study or send to your coach. It works out where the swing is inside a longer clip on its own, and it finds impact by listening for the strike, which is far more precise than the eye. Everything runs on your Mac — no accounts, nothing uploaded.

The beta is open. Join on TestFlight — no invite needed, and you’ll be running in a couple of minutes.

It’s a Mac app, so it installs through the TestFlight app for Mac rather than the iPhone one. You’ll need macOS 14 or later.

More about SwingKey.