Online Spirit Level — Phone Bubble Level
Turn your phone into a spirit level using its tilt sensor. Surface and edge modes, flip calibration and mm-per-meter readings. Sensor data stays on your device.
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How to use
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Tap Start and allow access to the tilt sensor
Choose surface (lying flat) or edge (standing up) mode and place the phone on the object
Check whether it’s level, the angle, mm per meter and how much to raise one end
How it works and good to know
The browser’s deviceorientation readings (beta, gamma) are converted into the direction of gravity to get left–right and front–back tilt. Height difference per meter is tanθ × 1000 mm and slope is tanθ × 100%. Flip calibration reads twice on the same spot, turning the phone 180° in between: device offset = (a1 + a2) ÷ 2 and true tilt = (a1 − a2) ÷ 2. Sensors report in 0.1° steps and vary by device, so treat readings as a guide. Sensor data is never sent to a server.