Bubble Level: Spirit Level

Turn your phone into a bubble level.

Bubble Level uses your device's built-in accelerometer to check whether a surface is flat, an edge is straight or something sits at the angle you need. Measuring works without an internet connection.

WHAT YOU CAN DO

• Check horizontal surfaces — tables, shelves, floors, appliances
• Check edges and vertical surfaces — shelves, picture frames, walls, door frames
• Hang pictures, mirrors and TV mounts straight
• Read the tilt angle in degrees
• Freeze the reading when the screen is hard to see
• Calibrate on a flat surface for better accuracy

TWO MODES

• Surface: lay the phone flat. A two-axis bubble shows the X and Y angles and the total tilt
• Edge: hold the phone upright against a shelf, frame or wall and read a single angle

FEATURES

• Readings in degrees
• One-tap Calibrate, and Reset calibration whenever you like
• Hold: freeze the current reading
• A beep when the phone reaches level, with an on/off button
• Dark and light theme, following your system setting
• The screen stays on while you measure
• Correct readings on tablets in landscape too
• Available in 14 languages
• Measuring works offline

ACCURACY

The app reads your device's accelerometer directly. For the most reliable result, place your phone on a surface you know is flat and run the calibration once. The calibration is stored on this device only: sensors differ from phone to phone, so it is not moved to a new phone with your backup. Calibrate again on a new device. Accuracy depends on your device's sensor quality, so this app is intended for everyday household and DIY use rather than professional engineering measurement.

ADS AND PERMISSIONS

This app is free and supported by a single banner ad at the bottom of the screen. The ad never covers the level or the buttons. Showing ads requires an internet connection; measuring does not.

The app does not access your camera, microphone, precise location, contacts, photos or files. Motion sensors do not require a runtime permission on Android.

Whether you are hanging a shelf, levelling a washing machine or setting up furniture, Bubble Level gives you a quick answer without digging out a physical tool.