A simple tool that uses your phone camera to measure how your fingers move, and shows you how those numbers change over weeks and months.
All measurements stay on this device. Nothing is uploaded anywhere.
Lay your hand on a table and slowly move the phone around it. There's no time limit — record as long as you want, then tap Stop when the compass on screen shows enough angles covered. Hand shake is fine. Camera shake is fine.
A kitchen table, a tea-towel, the carpet. Anything that gives some contrast against your hand works.
Daylight is best, but a ceiling lamp also works fine. Don't worry about shadows.
Lay your hand flat and slowly drift the phone around it during the recording. It does not have to be smooth or precise — the app averages everything together.
You can stop the recording any time after a couple of seconds with the Stop button. Longer captures are a little more accurate, but only marginally.
| Finger | MCP | PIP | DIP | Total |
|---|
Best frame from the recording, with the measured joint angles drawn on top.
Anatomical hand model posed to the measured joint angles. Drag to rotate, pinch to zoom. Fingers that lift off the table show their extension deficit; ones that dip below it show hyperextension.
No measurements yet.
A rising line means more bend at that joint. A flat line means stable. Day-to-day jitter of about ±9° is normal.