Spirit level in your browser · Live tilt angle in degrees · Accelerometer check · One-tap calibration. Lay your phone on a surface.
Tap to enable the level. iPhone will ask for motion & orientation permission.
This tool turns your phone into a bubble level (spirit level) using its accelerometer, right in the browser. Use it to hang pictures straight, level a shelf or appliance, or simply test that your phone's motion sensor works and is calibrated. No app, no install — it runs on any phone or tablet with a motion sensor.
Tap Start Level and allow motion access if prompted, then place your phone flat on the surface you want to check — a shelf, picture frame, table, or appliance. The bubble drifts toward the high side, exactly like a real spirit level; center it to make the surface level, and the badge turns green and reads "LEVEL" when you are within 1°. The Pitch and Roll values show the exact tilt in degrees. If your phone reads a slight angle on a surface you know is flat, tap Calibrate to zero it — this corrects for small sensor offsets and uneven phone cases. To check that something is plumb (truly vertical), such as a door frame or fridge, hold the phone flat against it with the screen facing you and use the Roll value to level it side to side.
The bubble drifts toward the high side of the surface, just like a real spirit level. Center it in the rings to make the surface level. The badge reads "LEVEL" in green when you are within 1°.
Pitch is the front-to-back tilt; roll is the left-to-right tilt, both in degrees. Together they give the exact angle of the surface so you can correct it precisely.
Phones and cases add a tiny offset. Rest the phone on a known-flat surface and tap Calibrate to zero it. To separate sensor offset from a sloped surface, rotate the phone 180° and compare.
Hold the phone flat against a wall or frame to check that it is plumb (truly vertical). Use the roll reading to straighten it side to side before fixing it in place.
For everyday tasks — pictures, shelves, TVs, washing machines — yes. After calibrating, a phone level is accurate to roughly 1°, which is well within tolerance for home use. For fine carpentry or masonry, a physical level remains the gold standard.
The level reads your phone's sensor locally, so once the page has loaded it keeps working even if your connection drops. Nothing is sent anywhere — all the angle calculations happen on your device.
Accelerometers pick up tiny vibrations, so the bubble can wobble slightly even on a still surface. Set the phone down and let it settle for a second. Persistent large jitter can indicate a failing sensor, which is itself useful diagnostic information.
Two reasons: the table may not be perfectly level, or your phone has a tiny built-in sensor offset (and a case can add a slight tilt). Place the phone on a surface you trust and tap Calibrate to zero out the offset. Rotate the phone 180° and check again to tell sensor offset from a sloped surface.
On iPhone (iOS 13+), Safari requires permission before any website can read motion and orientation sensors. Tap "Allow." If you denied it, enable it under Settings → Safari → Motion & Orientation Access and reload the page.
The accelerometer needs HTTPS and a tap to start. If nothing moves after starting, your device may lack a motion sensor (rare on phones, common on desktops), or motion access is blocked in your browser settings. Try on a phone or tablet for best results.