Plumb
Measure how your body actually moves — and only trust the change that's real.
Plumb uses your phone's camera to measure the angle your joints actually reach — a toe touch, an overhead reach, a deep squat, a split. It tells you the number, how sure it is, and whether today's reading truly beat last month's or just landed inside the margin of error. An instrument, not an instructor: no classes, no routines, no streaks to protect. Just the one measurement you can believe.
How it's different
Measured, not guessed
The camera finds your joints and computes the real angle you reached — the quantity a physio measures with a goniometer. The first thing you do is measure, with nothing to fill in first.
Honest about doubt
Every number carries its margin — “45°, to about ±2°.” Plumb shows what the camera can resolve and never dresses a guess up as precision.
Only real counts
A reading only counts as progress once it clears its own error band. No streaks, no confetti, no line that rises just because you showed up.
The one number you can trust
“47°, measured to about ±2°. Past the 6° band since March.”
Plumb separates two things most apps blur: how precisely the camera can measure you, and how much change actually means something. It's being validated against clinical goniometry before launch, and it reports its own reliability — because a mobility number you can't trust is worse than no number at all.
Seven movements
Private by design
The camera never leaves the phone.
- On-device vision. Pose estimation runs on your iPhone with Apple's Vision framework. The camera feed is processed on the device — never uploaded.
- Your measurements stay yours. Readings and history are stored on the phone and are yours to export any time.
- No account, no server, no ads. Like every Mayhaw app, there's nothing to sign up for and nothing to send.