Protractor: Angle Finder

Nils Röthlisberger

Contains ads

About this app

A protractor, angle finder and bubble level in one free app. Measure any angle three ways: lay a flat object on the screen, aim the camera at a corner, or tilt the phone against a surface. No sign-up, no internet needed.

TOUCH PROTRACTOR
Drag the arm to an edge and read the angle between them. The protractor snaps to 15°, 30°, 45° and 90°, and opens into a full 360° dial for reflex angles and miter cuts. Handy for homework, sewing patterns and workshop layout.

CAMERA ANGLE FINDER
Point at a corner and tap three points. The angle appears right in the live view. Freeze the frame to place the points exactly, then save or share the photo with the angle stamped on it.

CLINOMETER AND PLUMB BOB
Hold the phone against a wall, ramp or shelf and read the slope from gravity. It works as a digital inclinometer and as a hanging plumb bob, so you can check a post for true vertical without string. Calibrate on a surface you trust to set a real zero.

BUBBLE LEVEL
Lay the phone flat for a bullseye vial. Stand it on edge for a tube spirit level. The view switches by itself, and you can lock it while you press the phone against a frame.

EVERYDAY JOBS
Hang a picture frame straight. Measure a roof pitch. Mark a miter on a workpiece. Check a stair railing, a shelf or a satellite dish. Read the slope of a ramp or a drainage pipe.

Every reading works in degrees, radians or percent slope. Hold a value on screen and copy it with one tap.

The protractor runs entirely on your phone. Nothing is uploaded, nothing is tracked, and there is no account to create.

• Over 100 languages
• Works offline
• Small banner only, never popup ads

What’s new

Welcome to Protractor: measure any angle with your camera, by laying the phone on the object, or by tilting it against a surface.

• Touch protractor: drag the arm, snaps to 15°, 30°, 45°, 90°
• Camera measure: tap three points, share the photo with the angle on it
• Plumb bob and clinometer: check walls and slopes against gravity
• Bubble level built in: flat and on-edge modes
• Works offline · no account · no tracking