Protractor

1.7.00

EXA Tools

4.22

5,664 reviews

1,000,000+
Downloads

Free

Check angle and slope. Use the camera view !!!

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.

Download Statistics

Protractor has been downloaded 1.6 million times. In the last 30 days, the app was downloaded 18 thousand times.

User Ratings

Protractor is rated 4.22 out of 5 stars. The rating is based on 5.7 thousand ratings.

App Information

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.

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 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.

More data about Protractor

Price	Free to download
Total downloads	1.6 million
Recent downloads	18 thousand
Rating	4.22 based on 5.7 thousand ratings
Ranking	Not ranked
Version	1.7.00
APK size	6.92 MB
Number of libraries	19
Designed for Android	5.0+
Suitable for	Everyone
Ads	Contains ads

App Performance Report

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Alternative downloads for the Protractor app

Protractor compared with similar apps

Common keywords of similar apps

View Premium Shape Check Turn Modes Switch Additional Polygon Draw Image Lines Units Angle Camera Mode Measure Screen Plumb Measurements Protractor Slope Angles Object Touch Bob Measurement

Keywords missing from this app

Level App Tool Bubble Measuring Device Surface Ruler Finder Clinometer Meter Calibration Phone Features Spirit Tools Horizontal Recent Support Vertical Free Easy Display Laser Precise Pitch Digital Set Leveling Target Frame Measured Plane Smart Sensor Accurate

Google Play Rating history and histogram

Rating history

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Downloads over time

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Protractor has been downloaded 1.6 million times. Over the past 30 days, it averaged 600 downloads per day.

Changelog of Protractor

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Developer information for EXA Tools

EXA Tools

exatools@gmail.com

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Comments on Protractor for Android

★★★★★ 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.

★★★★★ John Suarez · Jul 15, 2025

Works as intended. The camera feature is very useful.

★★★★★ 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.

★★★★☆ 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.

★☆☆☆☆ 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

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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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