QuickLevel: Bubble Level

QuickLevel turns your phone into a carpenter's level you can read at a glance, hear, or feel.

Put the phone against the work and QuickLevel picks the right tool by itself:
• Stand it on its long edge: LEVEL (+ means the right side is high)
• Hold its edge against a post or stud: PLUMB
• Lay it flat: BULLSEYE, with the tilt of each axis
The screen turns with the phone, so the reading is always upright. You can also lock Level, Plumb or Bullseye from the AUTO menu.

BIG, CLEAR READING
• A large number, a glass bubble vial and red / yellow / green zones, always with words and arrows too, never color alone
• The whole screen turns green when you are on target
• Tap the reading to hold it; Auto-hold keeps the last steady reading when you lift the phone out of a tight spot
• Show the reading in degrees, % grade, rise over a length (the shim you need over 1–16 ft or 0.5–3 m), or roof pitch

TARGETS FOR REAL JOBS
• Level and plumb
• Angle finder (0–90°)
• Drain and ramp slopes: 1/16 to 1/2 inch per foot, or percent
• Roof pitches from 2:12 to 12:12
• Any angle, or a custom value in °, %, in/ft (fractions work), mm/m or x:12
• Adjustable tolerance from ±0.05° to ±1°

HANDS-FREE
• Sound: beeps speed up as you get closer, then a chime, with an optional steady tone and direction chirps
• Vibration: a tick when you are close, a double pulse on target
• Spoken readouts using your phone's offline voices

MORE TOOLS
• ZERO: measure one surface relative to another, or match an angle (shows the miter too)
• SAVE readings with a note ("kitchen, north wall"), then copy or share them
• Guided calibration for each side of the phone, so cases and camera bumps don't throw it off
• Dark and high-contrast Daylight themes, imperial and metric
• Home-screen shortcuts: Level, Drain ¼"/ft, Angle finder, Saved

FREE, WITH AN OPTIONAL ONE-TIME UPGRADE
QuickLevel is free and shows a small banner ad at the bottom of the main and Saved screens. The banner has its own space and never covers the reading, the vial or the buttons, and there are no full-screen ads.
QuickLevel Pro is a one-time purchase (no subscription) that removes all ads and adds:
• CSV export of your saved readings for Excel, Google Sheets or Numbers
• Two extra themes: Amber for dim attics and night work, and Blueprint
Everything listed above stays free.

PRIVACY
No account and no sign-in. The motion sensors are read on your phone only; your readings, notes, settings and calibration stay on your phone. Ads are served by Google AdMob (see the privacy policy).

ACCURACY
Precision depends on your phone's sensor. The 0.1° display is not a promise of 0.1° accuracy. Calibrate each side you measure with, check QuickLevel against a reliable physical level before relying on it, and don't use it in place of certified instruments for critical work. Presets are measurements only, not building-code requirements.