Upload a clip of one swing, filmed from the side your chest faces. Your video never leaves your phone — everything is measured right here in the browser. You get the handful of things actually worth fixing, a practice plan, and the full numbers behind it. It cannot see the bat, so it says nothing about bat path, attack angle, or contact point.
Do drill one until it feels normal, then move on.
| Measurement | You | Reference |
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Reference ranges are drawn from published work on hitting biomechanics, including Driveline's open-source dataset of ~98 hitters with measured bat speed. They are population tendencies, not rules — good hitters fall outside them. Contact is estimated from peak hand speed, not seen, so timing figures carry real uncertainty. Nothing here measures the bat.
Reading every frame of your clip.
Your video is read frame by frame on your own phone. It never travels to our server, is never stored, and is never seen by anyone — including us.
There is no database and no account. Only about a dozen anonymous numbers, like joint angles and timings, are sent to be turned into coaching. Close this page and even those are gone.
Most apps like this upload your video and keep it. We think a video of your kid belongs to you.