Bubble Level & Clinometer

A spirit level that tells you how sure it is.

Every reading shows its ± range and whether the phone is moving, settling or stable, so you know when a number can be trusted. When the angle is within its ± of zero, it says "Level ✓".

CALIBRATE ON ANY SURFACE
Two steps: lay the phone down, turn it half a circle, done. The surface doesn't need to be level. Typically the ± near level is then about ±0.1°. Accuracy depends on your phone's sensor; the built-in Sensor report shows what yours can do. The Calibration screen shows which positions are calibrated, and when.

MADE FOR REAL JOBS
• Flat: a bull's eye plus one tube per axis, for shelves, tables, washing machines and caravans
• Edge: stand the phone on an edge for a one-axis tube; the screen turns with it
• Plumb: hold it against a post or door frame
• Angle tab: measure the angle between two surfaces
• Target angles: 0°, 45° or 90°
• Direction words: "Raise the left side", "Move the top to the right"
• A beep and a buzz the moment it's level, for jobs where you can't see the screen
• Hold, and a "last stable" reading that stays after you pick the phone up
• Set zero: copy an angle from one surface to another
• Degrees or percent slope, both free

EASY TO READ
• Large numbers and a high-contrast theme
• Labels on every button; TalkBack reads the angle aloud

NO NONSENSE
• No ads, no account; works fully offline
• No data collected. Your readings stay on your phone
• Opens straight to the level: no tour, no pop-ups

A practical aid, not a certified measuring instrument. Don't use it for surveying, construction certification or anything where a wrong angle could hurt someone.

Recent changes:
First public release. Every reading shows its ± and whether it's stable. Calibrate on any surface in 10 s for typically ±0.1° near level. Flat, edge and plumb, angle between two surfaces, target angles, degrees or % slope, hold, beep and vibration. No ads, no account, works offline.