How much does Pebble Swing cost?

Pebble Swing costs $3.99 for five swing analyses, $9.99 for twenty, or $24.99 for one hundred. There is no subscription and no monthly fee: you buy a bucket once, spend it whenever you play, and it never expires. Your first analysis is free once you make an account. Payments run through Stripe, and a failed analysis never costs a read, because the charge happens only after the coaching report comes back. The work your phone does on its own is free and needs no account at all: finding the swing inside your clip, cutting the twenty-four key frames, tracking your body and measuring your tempo all happen in the browser. Only the written coaching read, which calls an AI model, is metered. At $24.99 for a hundred reads a single analysis works out to twenty-five cents, and the pack is yours until you spend it.

How accurate are Pebble Swing's measurements?

Pebble Swing measures body angles from a single phone camera, so treat them as a coach's eye rather than a laboratory reading: shoulder, hip and spine angles can be off by five to ten degrees, and the page says so next to every number. Tempo is the most reliable figure, because it is timed from the motion in your own footage rather than inferred from a body model, and it is only reported when the downswing stands clearly apart from the rest of the swing. Club speed, ball speed and carry are labelled estimates and are zeroed out when the frames cannot support them; they are not launch monitor numbers and are not presented as any. Accuracy depends on your footage more than anything else: a steady phone, the whole swing in frame, and good light will move the numbers more than any setting in the app.

Do I need to download an app?

No. Pebble Swing runs in a web browser on any phone, tablet or computer, with nothing to install and no app store involved. Open the page, add a clip, and the analysis starts. On a phone the page offers a record button that opens the camera directly, so recording and analysing a swing is two taps. Because the frame extraction and the body tracking run in the browser itself, the device does the heavy work, which is also why the video has no reason to be uploaded. You can add the page to your home screen if you want it to behave like an installed app. An account is needed only for the written coaching report, which is what calls the AI model; the frame-by-frame breakdown, the body angles and the tempo measurement are free and work signed out.

What camera angle should I film my golf swing from?

Film from one of two angles: down the line, standing behind the ball on the target line with the camera aimed at your hands, or face on, square to your chest. Down the line shows swing plane, club path and early extension; face on shows weight shift, spine tilt and where the low point sits. Hold the phone at waist height, take three big steps back so the whole swing including the club stays in frame, and keep the phone still, ideally propped on a bag rather than held. Three to ten seconds of video is plenty, and one swing per clip is better than several. Landscape or portrait both work. Good light matters more than resolution: a bright range bay at 30 frames a second reads better than a dim one at 60.

What is a good golf swing tempo ratio?

Roughly three to one, though the number is softer than it is usually made to sound. It comes from John Novosel counting video frames for his 2004 book Tour Tempo, not from a laboratory. When Robert Grober at Yale later put accelerometers in the shaft and measured 43 golfers, the playing professionals came in between 2.5 and 3.5 to one, averaging near 3.0 — a band, not a constant. The surprise in that data is that ordinary golfers average close to 3.0 as well. What separates a professional is repeatability and raw speed, not the ratio itself. And where an amateur does measure low, the cause is usually a dragging downswing rather than a snatched backswing: the two high handicappers Grober measured both took longer going back than the tour player did. Pebble Swing times both halves off your own footage and gives you a metronome you can set to your measured tempo.