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Fast-bowling analysis · closed beta

See your action clearly

Film one delivery on your phone. StumpSage finds your run-up, gather, back-foot and front-foot contact and release, measures what a coach would check, and tells you how sure it is.StumpSage measures what a coach would check, and tells you how sure it is.

Join the betaSee how it works

Move across the ground to scrub the delivery. Click to bowl it.Drag across the ground to scrub the delivery. Tap to bowl it.

Interactive model, not a real analysis

How it works

  1. Film

    Film one ball side-on, in slo-mo.

  2. Upload

    Upload it here, from your phone or computer.

  3. See

    Get your report on your own clip.

What you get

  1. Your key moments, on your own clip

    Back-foot contact, front-foot contact and release, marked on your video, frame by frame.

  2. The numbers a coach checks

    Front knee, trunk, stride and more, each with how sure we are.

  3. What to work on first

    The fixes that matter most, in a coach’s words.

Honest by design

Every number says how sure it is.

Where we can’t measure something, we leave a gap rather than guess.

Film it like this

  1. Side-on
  2. Hip height
  3. 12–15 m away
  4. Slo-mo (120 or 240 fps)
The full filming guide
Hip height, about 1 m
A bowler seen side-on, the whole body in the frame, landing on the front foot.
What your clip should look like

Your clips stay private.

Only you and the StumpSage coach who checks your analysis see them. Delete any clip, or your whole account, any time.

How we handle your clips

Questions

More in Help
Who can join?
It’s invite-only for now, for adults (18+).
What do I need?
A phone that films slo-mo, and something to stand it on at hip height.
How long does it take?
Usually a few minutes after you upload.
Do I need the app?
No. Everything works here, in the browser.

Next session at the nets, film one ball.

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