Bubble Level – Spirit Level

A precision spirit level for your phone.

Bubble Level turns your device into a proper measuring instrument. Calibrate it once to your own phone, and read any surface to a tenth of a degree — with a bubble that moves like real liquid and turns green the moment you are level.

Built to be read at arm's length, used one-handed, and trusted on the job.

FOUR INSTRUMENTS IN ONE

• Horizontal level — a full-width vial for shelves, frames, worktops and rails
• Vertical level — plumb reference for posts, door frames and studs, with deviation in mm/m
• 360° surface level — a bullseye with live X and Y readings for tables, appliances and floors
• Angle meter — an inclinometer with zero reference, hold, and a target angle

KNOW EXACTLY WHEN YOU ARE LEVEL

The status word changes as you approach zero, so you always know which way to move:

RIGHT HIGH → FINE ADJUSTMENT → ALMOST LEVEL → LEVEL

At the moment you reach level, the bubble settles into the target, the gates light up, the reading turns green and you feel a single quiet haptic tick. No flashing, no alarms — just a clear confirmation.

CALIBRATE TO YOUR OWN PHONE

No two devices sit perfectly flat. Place your phone on a surface you trust, tap Calibrate, and the app records your zero and saves it. The calibration screen shows sensor stability as it settles, so you know the reading is sound before it commits.

BUILT FOR REAL WORK

• Readings to 0.1° or 0.01°
• Adjustable level tolerance
• Haptic and optional sound confirmation
• Keep screen awake while measuring
• Landscape mode for a longer, finer vial
• Orientation lock
• Dark interface designed for bright sites and dim rooms

USE IT FOR

Hanging pictures and shelves · aligning TVs and wall mounts · levelling washing machines, fridges and furniture · checking worktops and floors · tiling · setting fence posts and door frames · caravan and boat trim · camera and tripod setup · DIY, joinery and site work.

PRIVATE BY DESIGN

• Measuring works completely offline — no signal needed
• No account, no sign-in
• No subscriptions, no paywalls, nothing locked away
• Your measurements, calibration and settings never leave your device
• The app is free and funded by advertising, served by Google AdMob
• In the EEA and UK you are asked for your ad-consent choices on first launch, and can change them at any time from Settings

ACCURACY NOTE

Bubble Level reads your device's accelerometer, so accuracy depends on your phone's hardware and on calibration. It resolves to a fraction of a degree and makes an excellent everyday reference — but for structural, safety-critical or certified work, use a certified instrument.

Calibrate once. Level anything.