Bubble Level – Ruler & Laser

Turn your phone into a precision bubble level, ruler and laser level — no toolbox required.

Bubble Level reads your device's motion sensors and shows three spirit levels at once: a horizontal tube, a vertical vial and a circular bullseye. Lay your phone on any surface and the bubble turns green the moment it's level, red the moment it isn't. Live X and Y angles are shown in degrees or percent slope.

Whether you're hanging a picture, mounting a TV, fitting a shelf, checking a washing machine or laying tile, it's the same tool a carpenter keeps in their pocket — already in yours.


★ THREE LEVELS, ONE SCREEN
- Horizontal tube level for left–right tilt
- Vertical vial for front–back tilt
- Circular bullseye level for both axes at once
- Bubble turns green when level, red when off
- Live angle readout in degrees (°) or percent slope (%)
- One-tap calibration for a perfectly flat reference


★ RULER
- On-screen ruler with scales on both edges
- Centimetres or inches
- Calibrate against a bank card so measurements match real life
- Great for quick measurements when no tape measure is around


★ LASER LEVEL
- Projects a true horizon line over your camera view
- Line stays level with gravity as you tilt the phone
- Green when aligned, red when off
- Read slope as a percentage grade


★ NOTES & TASKS
- Save measurements with the job they belong to
- Simple notes and a checklist, built right in
- Everything stays on your device


★ MADE YOUR WAY
- Deep Blue and Vibrant Yellow themes
- Degrees or percent slope
- Keep the screen on while you work
- Built-in flashlight for dark corners
- Available in 10 languages


★ ACCURATE BY DESIGN
Bubble Level uses your phone's fused rotation sensor — the same one games and navigation apps rely on — and smooths the signal so the bubble settles instead of jittering. Calibration lets you cancel out any tilt in your device's own sensors, so a surface you know is flat reads as flat.

Note: your phone's case, a raised camera bump or a warped screen protector can hold the device off the surface. For best results, calibrate on a surface you trust.


★ PREMIUM
Free version includes the bubble level and ruler. Premium adds:
- Laser level
- Keep the screen on
- Ad-free experience
- Vibrant Yellow theme

Choose a subscription or a one-time lifetime unlock. Prices, billing period and renewal terms are shown before you buy, and subscriptions can be cancelled anytime in Google Play. You can also unlock a premium feature for 24 hours by watching a short video.


★ PERMISSIONS
- Camera — used only to show the live view behind the laser level line. No photos or video are taken, stored or uploaded.
- We do not collect your measurements. Your notes and tasks stay on your device.


Whether you're a carpenter, electrician, tiler, DIY enthusiast or just hanging a shelf straight, Bubble Level gives you a fast, reliable spirit level whenever you need one.

Download Bubble Level and get it right the first time.