Protractor is popular, with 1.6 million installs. Users rate it well: 4.2 stars from 5,773 ratings. Show more ›
Protractor is made and published by
EXA Tools.
AppBrain is an independent app data site and isn't affiliated with EXA Tools.
The app name, icon, screenshots and description belong to EXA Tools and are shown as
published on Google Play.
Pros & Cons
Two free measuring modes (touch and plumb bob)
Premium polygon measurement with customizable visuals
Additional angle units (percent, radian) and laser/auxiliary lines in camera mode
Ad-free experience in Premium and overall modern feature set
Lacks built-in level and ruler tools advertised by some competitors
No explicit cross-device sync or cloud features mentioned
About Protractor
Protractor is a tools app developed by EXA Tools.
Install Statistics
Protractor has been installed 1.6 million times. In the last 30 days, the app was installed 15 thousand times.
User Ratings
Protractor is rated 4.22 out of 5 stars. The rating is based on 5.8 thousand ratings.
App Information
Protractor is freely available from Google Play. The app size is 6.92 MB. The latest version available is 1.7.00. The last update was on January 14, 2026.
Technical Requirements
Protractor requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since February 2016.
Description by EXA Tools(from Google Play)
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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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.
★★★★★John Suarez· Jul 15, 2025
Works as intended. The camera feature is very useful.
★★★★☆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.
★☆☆☆☆Gereth Dittrick· Nov 30, 2021
Was expecting a protractor not a level. Very misleading
★☆☆☆☆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.
Google Play Rankings for Protractor
This app is not ranked
Technologies used by Protractor
14 permissions·19 libraries
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