Bubble Level Tool
Turn your phone or laptop into a spirit level with the DeviceOrientation API — live two-axis tilt in degrees with one-tap calibration. Free and fully on-device.
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What is Bubble Level Tool?
A Bubble Level Tool turns a phone or laptop with orientation sensors into a spirit level: it reads the DeviceOrientation API, shows the tilt of the surface in degrees on two axes with an animated bubble, and offers one-tap calibration to treat any position as level zero.
Key Benefits
- Check flatness of shelves, mounts and appliances anywhere
- Measure relative tilt between surfaces with calibration
- No extra app — runs in the browser and works offline
Common Use Cases
- •Hanging picture frames and mounting TVs level
- •Setting up tables, tripods, 3D printers and appliances
- •DIY construction and campervan or boat leveling checks
How to use your phone as a bubble level
- Place and start: Lay the phone flat on the surface you want to check and press Start sensor — grant motion permission if the browser asks.
- Calibrate if comparing: To compare against a reference surface, press Calibrate here while resting on the reference so it becomes level zero.
- Read the tilt: Watch the bubble and degree readouts on both axes; the status turns green and says Level! when both are within ±1°.
Key Features
- Live two-axis tilt readout in degrees via the DeviceOrientation API
- Animated bubble that tracks the device tilt visually
- One-tap calibration to mark any surface position as level zero
- Green level indicator within ±1° of flat
- iOS motion permission handling and fully on-device processing