How it works
How we measure your match, and how sure we are.
One phone behind the glass sees a lot, but not everything. This page explains what happens to your video, what each number is based on, and what we deliberately leave out.
From video to report
- The court. We find the court lines in the video and you confirm them. That turns every position in the picture into metres on the court.
- The players. A body-tracking model finds the four players and their joints (shoulders, elbows, wrists, knees) in every frame. Players are told apart by their clothes, so changing ends is fine.
- The shots. Every shot makes a short "pop" that the phone's microphone picks up, also for the far pair. The sound says when a shot happened; the movement of the players says who hit it and what it was.
- Positions and pair play. From the positions in metres: distance, speed, time at the net, in no man's land and in defence, how often both partners were at the net, and how often one was up and the other back. Only rally time counts, not the walking between points.
- The report. Each player gets a play-style label based on what set them apart in that match, what went well, and up to three training priorities, ranked by how much they matter, how often they happened and how sure we are.
How sure is each finding?
Every number has a minimum amount of data behind it and a confidence based on how much of the time the players were actually in view. That decides how it's shown:
| Label | Meaning |
|---|---|
| Clear | Enough data and high confidence. Stated plainly. |
| Likely | The numbers point that way, but with gaps, for example a player out of view part of the time. |
| Experimental | Technique checks from body position at the moment of contact. Shown, but not yet validated against coaches. |
| Left out | Too little data or too uncertain. The report says why instead of showing a number. |
How accurate is it so far?
The shot model was trained and tested on PadelTracker100, a public dataset of professional matches with every shot labelled by hand. Tested on a match it hadn't seen:
- about 85% of shots found;
- the shot type (forehand, backhand, overhead, serve) right 73–81% of the time;
- the right player credited with the shot about 90% of the time.
Those numbers come from professional TV footage. On club matches filmed with a phone, we're measuring
accuracy now, match by match, and we'll publish the results here. Until then, technique checks stay marked "experimental".
What we don't measure yet
- Who won a point, winners and errors. That depends on where the ball landed, which a phone behind the glass can't see reliably.
- The score. Same reason.
- Ball speed and shot direction. The ball is too small and fast in a phone video to track well enough.
- Serve and return statistics are only shown when serves are recognised reliably in your video; otherwise they're left out.
Get a good recording
- Middle of the back glass, as high as you can reach (2.5 to 3 m is ideal), landscape.
- The whole court and the far glass in view, and the floor right below the camera too. If not, use the 0.5× lens.
- 1080p at 60 fps, HDR off, sound on.
- Airplane mode or Do Not Disturb, battery above 50%. An hour of video is about 6–9 GB.
Your data
Only you and the people you share a match with can see it. Share links leave out photos of the players unless you turn them on. The original video is deleted 30 days after the analysis. See the privacy page.