Plumbline: Spirit Bubble Level

PLUMBLINE reads true.

A spirit level, bubble level, angle finder, inclinometer and roof pitch gauge in one app. Six modes, one thumb away: a surface bubble for worktops and washing machines, an edge level for shelves, plumb for door frames and posts, a full inclinometer with a reference delta for comparing two surfaces, roof pitch in X:12, and a camera level that lays a live horizon over whatever you point the phone at.

Readings come from your phone's real tilt sensor, smoothed and shown in degrees, percent slope, roof pitch or millimetres per metre. Hit ZERO to tare against any reference surface, or run the thirty-second flip calibration: lay the phone flat, turn it a hundred and eighty degrees, and the averaged pair cancels out the sensor's own error. Most level apps never do this. That is why they disagree with your spirit level.

When a surface hits level the bubble snaps green, the screen flashes, and a short chirp and a haptic tick confirm it without you looking. HOLD freezes a reading while you climb down the ladder. SAVE logs it with its mode, a timestamp and a note like "kitchen counter, north wall". The screen stays awake while you work.

No account. Your readings never leave your phone. A small banner keeps Plumbline free, never a full-screen advert, and one Remove Ads purchase turns advertising off forever.