Protractor by EXA Tools turns your Android device into a smart angle-measuring instrument with camera-assisted measurements. It offers two free modes—Touch measure and Plumb bob—and a Premium Polygon Measurement that adds color customization and new angle units.
Pros & Cons
Camera-based measurements with real-world object alignment
Premium Polygon Measurement with color customization and helpers
Supports multiple angle units (percent, radian)
Screenshots available across all modes
Not ranked in any top lists currently
Lacks traditional level or ruler tools (level, ruler, meter) that some competitors offer
About Protractor
Protractor is a tools app developed by EXA Tools.
How many times has Protractor been downloaded?
Protractor has been downloaded 1.6 million times. In the last 30 days, the app was downloaded 16 thousand times.
What is the rating of Protractor?
Protractor is rated 4.22 out of 5 stars, based on 5.7 thousand ratings.
Is Protractor free?
Protractor is free to download. The APK download size is 6.92 MB. The latest version available is 1.7.00. The last update was on January 14, 2026.
What are the requirements for Protractor?
Protractor requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play February 2016.
Description
Protractor - smart instrument to measure angles. Turn on the camera mode and measure the angle of buildings, mountains, or any other object around you.
This app includes two free measuring modes: - Touch measure - touch the screen to set the angle (use camera view!). - Plumb bob measure - pendulum - use to determine the slope (remember to calibrate the plumb).
In each mode, you can switch to camera view and take measurements of all objects around you.
Additional Premium mode: Polygon measurement lets you draw any shape on your screen to check all its angles. Turn on the camera to see the real object through your phone and copy its shape. You can also pick a photo from your gallery or take a new picture to draw a shape on the image. In Premium mode, you can change colors, add helper lines, and switch between different angle units.
All modes allows you to make a screenshot of anything on the screen.
Enjoy !!!
Recent changes: Bug fixes and stability improvements New Premium features: - No ads - Polygon Measurement - Angle measurements on image - Angle measurements on camera preview - Color customization - Additional angle units (percent, radian) - Customizable plumb bob shapes - Laser and auxiliary lines in camera mode
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Works as intended. The camera feature is very useful.
★★★★★Su· Feb 5, 2021
Really neat. The lock and photo features are handy. Plumb tool is also cool, although it briefly confused me until I found the toggle back to basic angle measurement. Adverts are subtle enough not to interfere. Thank you.
★★★★☆Deon Van der Westhuizen· Jul 25, 2021
So far so good. I like the clear markings. The adds only show after I used the app which is not a problem. I would like to see an indication of which side is higher when I work with small inclinations.
★★★★★j sykes· Nov 10, 2023
Brilliant design. Also comes with a visual plumb bob. I love the way the camera can be used to view a room or object. The protractor outline overlays the camera image and can be used to measure angles, hang pictures, and predict location of wall studs.
★☆☆☆☆Seth K· Jan 29, 2023
This app makes no sense. In one mode you can only measure an angle against a horizontal line. Another option lets you use the camera and adjust 2 angle lines independently. "This means you snap a photo then accurately measure it" is what a sane person would think. Nope. You have a live video feed and have to adjust 2 angles live while aligning the fulcrum live while trying to hold the camera steady, live. So it's about as accurate guessing the angle, but slower and more frustrating.
★☆☆☆☆Gereth Dittrick· Nov 30, 2021
Was expecting a protractor not a level. Very misleading
Google Play Rankings for Protractor
This app is not ranked
Technologies used by Protractor
14 permissions·19 libraries
Subscribe to see full permission and library details
Trust & Safety: Requires CAMERA, INTERNET, and network-state permissions to enable camera-based measurements and online features; uses AdMob and Firebase for ads/analytics; standard Android permissions with no highly sensitive access beyond camera.
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