How far is your driver swing worth? Film it, and GolfSpeed estimates your club head speed from the video, then projects the carry that speed is good for — all on your device.

No account. No sign-up. No internet connection. Your video never leaves your phone.

TRY IT FREE FIRST

This is a paid app with no trial, so try the browser version before you buy:

https://golfswing.willconia.com

Two free analyses, no sign-up. If the numbers look right, the app gives you unlimited analyses offline.

RIGHT-HANDED DRIVER SWINGS, FILMED FACE-ON

GolfSpeed assumes a right-handed golfer with a standard 44.5" driver. It is not an iron or wedge app, and it does not support left-handed swings. It also needs a face-on video — camera in front of you, square to your chest. Filmed from behind (down the line), the swing reads slower than it is.

WHAT YOU GET

• Estimated club head speed in mph and m/s
• Projected ball speed, carry and total distance
• Automatic key frame detection — top of backswing, impact, top of finish
• Frame-by-frame player that snaps to each detected key frame
• Trim your clip before analysis to isolate the swing
• Enter your shoulder-to-wrist length (metres) and driver length (inches) so the scale matches your build
• A built-in sample swing to see the flow before filming your own

HOW IT WORKS

A pose model (MoveNet) tracks your shoulders, elbows and wrists frame by frame. A double pendulum model of the swing is fitted to that motion. The club is never tracked — the model only ever sees your body — so it is treated as an extension of your forearm at the length you enter.

Distance is then projected from that speed with fixed tour-average factors: 1.48 smash factor, 1.67 yards of carry per mph of ball speed, plus 10% run. The formula is printed on the results screen.

ONE MEASUREMENT DOES THE MOST WORK

There is no reference object in your video, so GolfSpeed uses your arm to turn pixels into real distance. Your shoulder-to-wrist length anchors everything else and the speed scales directly off it — enter a length 10% too long and every number lands roughly 10% too high.

Measure from the point of your leading shoulder (the left one if you swing right-handed) to the wrist crease, arm hanging straight, and enter it in metres. The 0.58 m default is a typical adult value; your own measurement is the cheapest way to improve your results.

PRIVACY BY DESIGN

Most swing apps upload your video to a server. This one cannot — it makes no network calls at all.

• No data collected
• No analytics, no tracking, no ads
• Works in airplane mode

WHAT YOU NEED

• A face-on video of a full driver swing
• Good lighting and a clear view of your upper body
• 30 fps is enough — the default on nearly every phone

Analysis runs on your phone's processor: a few seconds on recent hardware, noticeably longer on a budget device.

PLEASE READ BEFORE BUYING

Every number here is calculated from video. Nothing is measured by a sensor.

Club head speed is itself an estimate. Camera angle, frame rate, lighting and how cleanly the pose model locks onto your body all move it — and the app reads a flat video of a motion that happens in three dimensions.

Distance is projected from that estimate, so any error in the speed carries straight through to the yardage. The projection also cannot see strike quality, spin or launch angle. The conversion factors are tour averages, and tour players strike the ball better than the rest of us, so an off-centre hit or high spin travels less far than the screen suggests. The speed estimate can also read low. The two pull opposite ways, and neither is corrected.

So use the number as your own baseline rather than a figure to quote. Comparing this week to last week, on the same phone and the same camera angle, is what GolfSpeed is built for. It is a training aid, not a replacement for a radar or optical launch monitor.

Willconia

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