Inclinometer & Bubble Level

MARKAROV.DEV

About this app

Check that a shelf is level or that a washing machine stands straight. Lay the phone on the surface and read the tilt in degrees. When both axes are within half a degree of zero, the word "level" replaces the number and the screen tints teal. The phone buzzes once.

Lay the phone flat and this bubble level shows a bullseye and two numbers, pitch and roll, in degrees. The bubble and the signs of the numbers show which way the surface leans, so you can tell which table leg or which corner of a caravan to raise. Stand the phone on an edge and the screen becomes a tube, like the vial of a spirit level, for the top of a picture frame or the lip of a shelf.

The same reading makes it an inclinometer. The large number is the angle from level. The "Set as zero" button makes any surface the reference, so the app also works as an angle finder between two surfaces. Set the floor as zero, then bring a shelf above it to the same slope. The zero is saved, so the two surfaces can be in different rooms.

Calibration works on any surface. A spirit level is checked by turning it end for end, and the app does the same: two readings half a turn apart cancel the tilt of whatever the phone lies on, so you do not need a flat table. The "Check the level" button takes the same two readings without saving anything and shows the phone's own error. At 0.3° or less, the phone passes.

Also in the app
• Bullseye when flat, tube on an edge. It switches by itself.
• Sound as it comes level: the clicks speed up as the tilt nears zero, so you can keep both hands on the shelf.
• A threshold with a beep when the tilt goes above or below an angle you choose.
• Case thickness in millimetres: the bump of a case or camera is turned into an angle and subtracted.
• Hold freezes the reading, and the volume buttons do the same, so you do not have to touch the screen. Share sends pitch and roll as text.
• A home-screen widget with the last reading.
• Measuring works without internet.

Good to know
As a bubble level or an inclinometer, the app measures the tilt of the phone itself. Its reference edge is the long side of the body, usually 150–165 mm, and the figure for your phone, rounded to 5 mm, is shown at the top of the screen. A builder's spirit level is many times longer, so a small error under the phone grows along a long board. Check a long surface at both ends, and lay the phone directly on it rather than holding it. Screenshots of the measuring screen were taken in the built-in demo mode.

There are no ads or purchases in the app. It sends anonymous usage statistics, which you can turn off in settings.

Independent development: one person builds and maintains this app. A letter to [e-mail] is read by that person, not by a support desk.

What’s new

New look: the angle always stays large, also when the phone is level, with the verdict in a capsule under it. Pitch and roll have tiles of their own. Info and settings are icons in the top bar, and button labels are no longer in capitals.
When you share a reading or a saved measurement, the last line is now a link to the app on Google Play.