Bubble Level

The app includes: bubble/spirit level for horizontal/vertical measurements, bull's eye level for plane surfaces, angle finder/inclinometer, built-in ruler (cm/inches), calibration options, and multiple measurement modes. It can be used for hanging pictures, furniture assembly, construction work, and setting up equipment.

To calibrate, open calibration settings, place your device screen facing up on a perfectly level surface (like a floor), and press SET. You can press RESET to return to factory default calibration. The app allows calibrating any side independently, either relatively or absolutely.

Yes, the app uses your device's gyroscope sensor and has been calibrated by manufacturers to provide accurate measurements. It offers professional-grade accuracy for construction and carpentry tasks, with configurable acceptable deviation values from 0° to 1° (default <0.3°).

Simply hold any of your phone's four sides against an object to test if it's level or plumb, or lay it down on a flat surface for 360° level measurement. The app displays results similar to a real level meter, with bubbles moving away from center when surfaces are not level.

There are both free and premium (PRO/No Ads) versions available. The ad-free version provides a clean interface without interruptions and requires no special permissions to use.