Local-only sensor data
POCKET SENSOR · AUTOMATIC TIMING
Measure the hang.
See the progress.
Tap once, put your phone snugly in a pocket, get on the bar, hang, and get off. Motion brackets the quiet hanging interval automatically.
Checking motion sensor support…
- 1Tap startAllow motion access on iPhone
- 2Pocket phoneKeep it snug against your body
- 3Hang, then get offThe result saves automatically
YOUR PROGRESS
Built from every hang
Duration trend
Oldest to newest · tap a history row for sensor details
LOCAL HISTORY
Sessions
No hangs yet
Your recordings, automatic boundaries, and swing estimates stay in this browser.
WHAT THE PHONE SEES
Motion → quiet hang → motion
The app uses linear acceleration, so static Earth gravity is removed by the phone sensor. It finds the longest sustained low-motion interval bracketed by getting on and off the bar.
Gravity-aware
The sensor subtracts an estimated 9.81 m/s² gravity vector; gravity still drives the swing physics.
Sway analysis
Signed axes are checked for a pendulum-like frequency and equivalent small-angle pendulum length.
Private by design
Raw samples use IndexedDB; settings use localStorage. There is no account, analytics, or upload endpoint.