LevelMaster: Bubble Level

LevelMaster turns your phone into a precision spirit level and angle meter, using the built-in motion sensor — no extra hardware needed.

BUBBLE LEVEL
• Circular bubble level for flat surfaces — lay the phone on a table, shelf or countertop
• Bar bubble level for vertical surfaces — hold it against a wall, door frame or picture
• Automatically switches between flat and vertical modes as you move the device

ANGLE METER
• Large protractor-style gauge with a live degree readout
• "Set as 0°" lets you zero out any starting angle — handy for measuring a slope or a change in angle (e.g. a ramp or a roof)

LEVEL ALERT
• A confirming beep and a light vibration the instant the device becomes level
• Turn the beep or vibration off independently in Settings

CAMERA OVERLAY
• See a level line through the camera while you hang a shelf, a frame or a piece of art
• The line turns green the moment it's level

CALIBRATION
• Correct small sensor offsets against a known-level reference, per device

MADE FOR EVERYONE
• Light & dark themes with multiple accent colors
• English and Japanese
• Keep the screen on while measuring

PRIVACY FIRST
• Works fully offline. The camera is used only to overlay the level line — nothing is ever captured, saved, or sent anywhere. No account, no cloud, no tracking.

Great for DIY projects, hanging furniture after a move, and checking a boat or dock is level while fishing.

Note: readings are approximate and depend on your device's sensor. LevelMaster is intended for everyday DIY use, not for professional or regulatory measurements.

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