Bubble Level

Use your phone's tilt sensors as a two-axis bubble level.

How to use

1. Open the tool on a sensor-equipped phone or tablet and tap Enable sensors.
2. Place the phone flat to center the circular bubble, or against an edge to read horizontal and vertical angles.
3. Tap Set zero to measure relative to the current surface, or Reset zero to return to the device baseline.

Features

• Two-axis circular bubble level
• Left/right and front/back angle readouts
• Relative zero calibration
• Level indication within one degree

Good to know

• Sensor access requires HTTPS or an installed app/PWA. Desktop computers commonly have no orientation sensor.
• Remove a thick or uneven phone case when you need a more reliable physical reference surface.
• This is a convenience tool, not a replacement for calibrated construction or safety equipment.