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Bubble Level - Level Tool turns an Android phone into a simple level for checking whether a surface is horizontal or vertical. It suits small jobs around the house, such as hanging a picture, fitting a shelf or adjusting an appliance, as well as practical tasks like lining up a tripod.
Place the phone flat on a surface to check it across a plane, or hold it against a surface to check its alignment. The app shows the angle, with the bubble indicating when the reading is level. It also includes a clinometer for measuring inclination, so it can help with more than a straightforward horizontal check.
For example, you could use it to see whether a table is tilted, check a shelf while fitting it, or make a quick adjustment to a camping table. It is a handy reference for occasional measuring tasks, though the result depends on how the phone is positioned and calibrated.
The app offers horizontal and vertical level readings, along with a bull’s-eye level view. Calibration and reset functions let you adjust the reading, and relative and absolute calibration provide different ways to set a reference. A screen lock can help prevent the direction from changing during a check. Sound reminders, plus light and dark modes, round out the available options.
With a 4.82 rating from about 38,000 reviews and more than 1,000,000 installs, Bubble Level - Level Tool has found a broad audience for a focused task. It is developed by Simple Design Ltd. If you need a level only now and then, keeping one on your phone can save the trouble of looking for a separate tool.
