QJI Bubble Level - Level Tool

Turn your phone into a level tool and a bubble level AR guide that reads any angle in seconds. This app shows tilt as big, clear numbers, so you can check a shelf, a floor or a picture frame without a toolbox. No ads, no tracking, nothing collected.

Hold the phone against a surface and the app tells you how far it is from perfectly flat or perfectly vertical. It works as an angle finder for DIY jobs and for everyday checks around the house. Pick the view you need and read the result from across the room.

Camera mode (Pro) puts guide lines over the live camera image, a bubble level AR style aid that helps when you line up a frame, a TV bracket or a row of tiles. The other modes work straight from the phone sensors.

Modes:
- Level mode: rest the edge of your phone on a surface and read the horizontal tilt, like a classic leveling tool
- Plumb mode: hold the phone upright to check that a wall or a door frame is vertical
- Flat mode: lay the phone flat and watch the bubble move on two axes, as on a real spirit level
- Camera mode (Pro): see level guide lines over the live camera, as in a bubble level AR view

Measurement tools:
- Save readings and pull them up later (3 free, unlimited with Pro)
- Lock the current value and compare it with a new surface
- Relative zero (Pro): set any tilt as a new zero reference, handy for sloped floors
- Units: degrees for free, or switch to %, in/ft and mm/m with Pro, so the angle meter fits your trade

Calibration that matters: phone sensors drift, so the app includes a full 6-direction, 2-position routine and warns you if the phone is not calibrated yet. A calibrated phone gives you an accurate level on every job. Keep one profile for free, or save up to 3 with Pro, which is useful if you switch between a bare phone and one in a case.

Alerts and appearance:
- A visual alert when you hit level, free
- Sound and vibration alerts with Pro
- Dark theme, free
- Custom theme color with Pro

Who is it for? Anyone who hangs pictures, builds furniture, fits shelves, sets up a camper or a 3D printer bed, or checks that a washing machine stands straight. Carpenters, tilers and installers can open this level tool as a quick level app on the job. Hobbyists who run an angle measure on a ramp or a roof find it just as handy.

Privacy first: no ads, no analytics or tracking SDKs, and no data collected, because the app simply does not ask for it. Camera access is only requested if you open camera mode. It is just as handy on a roof, in a basement or on a remote site.

Start with the free angle meter app tools, then unlock the angle meter pro app features if you need more. Pro adds camera mode, relative zero, extra units, extra calibration profiles, sound and vibration alerts and theme colors as a single one-time purchase. No subscription, no renewal. Want an angle meter free of charge for quick checks? The free version already covers it.

The app is available in 23 languages. Download Bubble Level & Spirit Level today and keep a reliable level tool in your pocket.