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The privacy policy and update check now use the new site address, markarov.dev. The old address keeps working for now, but it will be retired. Nothing else changed.
Bullseye and tube. Green and a buzz at zero.
The level measures the tilt of the phone itself, resting on a surface. Its reference edge is the long side of the body, 150–165 mm on an ordinary phone: many times shorter than a builder's level, so a small error at the phone becomes a large one at the far end of a board. The exact length for this phone is named at the top of the instrument. Calibration here does not need a flat surface: two readings a half-turn apart cancel the tilt of whatever it lies on. The instrument uses the phone's gravity sensor and shows the value in °. • A bullseye when the phone is flat — both axes at once. • A tube when the phone stands on an edge. • The screen goes green and the phone buzzes at zero. • One-tap calibration: a case and the camera bump are subtracted. • No ads. Under a megabyte. Works without internet. The app sends anonymous usage statistics; you can turn this off in settings. Independent development: one person builds and maintains this app. A letter to support@markarov.dev is read by that person, not by a support desk.