Install Expo Go from the App Store first. Then scan the QR code below from inside Expo Go.
If Safari says "address invalid", that's normal on iOS 17+ — use the QR code above instead.
1
Install Expo Go from the App Store (free, ~50 MB).
2
Open Expo Go and tap
Scan QR code at the bottom of the home screen.
3
Point at the QR code above.
4
Sign up with any email + password. Stand sideways 6–8 ft from the camera, capture, see your A–F posture grade.