Protractor: Angle Finder Level

Turn your phone into a precision angle measuring tool. Protractor measures angles using your device's motion sensors or camera — no extra hardware needed. Whether you're checking a roof pitch, setting up a workout, hanging a shelf, or finishing a geometry assignment, you get a fast and accurate reading in degrees, percent slope, or roof pitch notation. ▸ THREE WAYS TO MEASURE • Sensor mode — rest your phone on any surface and read the angle directly from the built-in motion sensors. • Camera mode — point your camera at an object and measure the angle on screen without touching it. • Photo mode — import a photo from your gallery and measure angles on the image. ▸ BUILT-IN BUBBLE LEVEL A full spirit level is included. Use it as a digital level, bubble level, or level tool to check whether a surface is flat, plumb, or square. ▸ 18 MEASUREMENT MODES Each mode is tuned for a specific job, with the right units and guidance: • Body & Joint Angle — knee, elbow and hip range of motion, like a digital goniometer • Surface & Corner — angle between two walls or surfaces • Terrain & Slope — ground slope, driveway and grade % • Hang & Level — level frames, shelves and furniture • Workout Form — squat, bench and exercise form angles • Geometry & Homework — measure angles on shapes and paper • Knife Sharpening — bevel and edge sharpening angle • Sports & Hobby — climbing, 3D printing, archery • Automotive — camber, seat recline and driveshaft • Bike Fit — knee, back and saddle angles • Plumbing & Pipe — pipe bends and conduit angles • Audio & Speaker — speaker toe-in, monitor and TV tilt • Stairs — stair pitch and handrail angle • Measure on Photo — import a photo and measure on it • Astronomy & Dish — azimuth and elevation for dish or scope • Roof Pitch — roof pitch in degrees and x:12 • Golf Club — club lie and loft angle • Solar Panel — panel tilt and best sun angle ▸ MADE FOR REAL WORK • Switch between measurement units to match the job • Sound and haptic feedback so you know the moment you hit the target angle • Clean, readable display that works at arm's length • Works offline — no internet connection required ▸ WHO IT'S FOR Carpenters, woodworkers, roofers, DIYers, mechanics, plumbers, electricians, physiotherapists, coaches, students, photographers and anyone who needs an angle finder in their pocket. Use it as a protractor, angle finder, angle meter, inclinometer, clinometer, slope meter, tilt meter, goniometer, degree finder, spirit level or digital level — all in one app. ▸ ACCURACY NOTE Readings depend on your device's sensors and how the phone is held. Protractor is built for practical, everyday measurement — for work requiring certified tolerances, confirm with a calibrated instrument. ▸ SUBSCRIPTION Protractor is free to download and includes core angle measurement. A subscription unlocks all measurement modes, unit switching, and sound and haptic feedback. • Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. • Manage or cancel your subscription in Google Play Store settings. • A free trial, where offered, converts to a paid subscription unless cancelled before it ends. Terms of Use: https://protractorapp.com/terms/ Privacy Policy: https://protractorapp.com/privacy/ Questions or feedback? https://protractor.featurebase.app