Phone sensors
Hold still, tilt gently, then keep a record of what changed.
1 · Start with permission
Open this page over HTTPS on your phone. No account or install is needed.
Not started. No readings collected.
If asked, allow motion and orientation. A browser may allow one but not the other. A missing reading is not zero.
2 · Motion
Place the phone screen-up on a table. Keep its top edge pointing away from you.
DeviceMotion: acceleration including gravity, in m/s². x points right, y toward the top edge, z out of the screen. A still phone can show about 9.8 m/s² from gravity.
3 · Tilt and level
Tilt gently sideways, then return the phone to the table. Keep portrait orientation.
Waiting for tilt.
DeviceOrientation: alpha is rotation about z, beta is front-to-back tilt, gamma is sideways tilt, in degrees. Bubble travel is limited at ±30°. This is a classroom cue, not a calibrated tool.
4 · A location fallback
No motion support? Try one location reading, or write an area note below. Location is optional and stays on this page unless you save it.
The accuracy radius is an estimate in metres. One fix does not prove a route or continuous presence.
5 · Keep the evidence
0 saved records. Nothing is sent.
Inspect the latest record
No saved record.
Save up to 20 snapshots in this browser. Keep denied or missing states in your notes. Clear them when finished. Changing phone, browser or placement means you should repeat the check.