How the app learns, and how your privacy is protected
The app can get better at three things. All of them are off until you switch them on, and your video never leaves your device.
1. Your own history
It keeps your results on this device and tells you whether a new result is within your usual range or a real change.
2. Your corrections
When you move a phase marker (for example the frame you took off), it learns how you define that moment and applies it next time.
3. Shared learning (optional)
If you agree, rounded numbers with no name are sent to a server. From many people’s numbers it works out typical ranges and trains better phase detection, then sends improvements back to everyone.
Safeguards on shared learning
- A new detector is released only if it beats the current one on clips it was not trained on. Otherwise nothing changes.
- Every update is digitally signed. The app rejects anything unsigned, tampered with or older, and can roll back.
- The server refuses any submission that contains a field it did not expect, so names or ids cannot slip in.
- For athletes under 18, nothing is saved or shared until a parent or guardian agrees, and sharing also needs the organisation running this site to switch it on.
What learning does not do
- It does not retrain the body-tracking model itself.
- It does not diagnose or predict injury.
- It cannot make a poor video give good numbers.
Athletes on this device
A profile lives only on this device. The nickname is never sent anywhere.
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Exactly what is shared, and what never is
May be shared (only if switched on)
- Which tool and which camera view you used.
- A frame-rate group (30, 60, 120, 240 or 1000).
- The measured numbers, rounded (for example whole degrees), with how confident the app was.
- With curve sharing: a 64-point, scale-free curve of the movement and the position of each phase, and whether you set it by hand.
- A random single-use code so the server can ignore duplicates. It is not linked to you.
Never shared
- Your video or any picture.
- Your name, nickname, profile id or any account.
- The date, time or length of the recording.
- Your device, browser or location.
- Anything about a result marked low confidence.
Like any website, the server sees the network address a request comes from. The operator should not keep it (see the privacy notes in the project).
“Anonymous” here means nothing that names you is attached and the numbers are rounded. A person’s movement pattern can in principle be recognisable, which is why sharing is optional.
Waiting to be shared
0 results waiting on this device.