Smart Protractor

1.6.4

Smart Tools co.

4.12

17,207 reviews

5,000,000+
Downloads

Free

Measure the angle and slope of an object with your phone.

About Smart Protractor

Smart Protractor is a tools app developed by Smart Tools co..

Download Statistics

Smart Protractor has been downloaded 5.2 million times. In the last 30 days, the app was downloaded 7.9 thousand times.

User Ratings

Smart Protractor is rated 4.12 out of 5 stars. The rating is based on 17 thousand ratings.

App Information

Smart Protractor is FREE to download. The APK download size is 6.00 MB. The latest version available is 1.6.4. The last update was on May 31, 2026.

Technical Requirements

Smart Protractor requires Android 4.4+ or higher. The app has a content rating of Everyone. The app has been available on Google Play September 2010.

Description

Smart Protractor is in the 1st set of the Smart Tools collection.

This app measures the angle and the slope of an object. It has three protractor modes.

1. Touch mode : for angle. After putting an object on the screen, touch the screen.
2. Plumb mode : for slope. A weight shows the slope of your device.
3. Camera mode : goniometer, inclinometer. It uses camera view.

* Main features:
- Tilt units (degree, percent, radian)
- Zero calibration
- Orientation sensor on/off
- Material design

* Pro version added features:
- No ads
- Various Tilt units
- Screen capture
- Ruler, level, thread pitch

* Do you want more tools?
download [Smart Ruler Pro] and [Smart Tools] package.

For more information, watch YouTube and visit the blog. Thank you.

Recent changes:
- v1.6.4 : More models have been calibrated
- v1.6.2 : Support for Android 16

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More data about Smart Protractor

Price	Free to download
Total downloads	5.2 million
Recent downloads	7.9 thousand
Rating	4.12 based on 17 thousand ratings
Ranking	Not ranked
Version	1.6.4
APK size	6.00 MB
Number of libraries	32
Designed for Android	4.4+
Suitable for	Everyone
Ads	Contains ads

App Performance Report

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Alternative downloads for the Smart Protractor app

Smart Protractor compared with similar apps

Common keywords of similar apps

Smart Touch Units Pro Slope Protractor Angle Object Tools Mode Screen Camera Features Tilt Ruler

Keywords missing from this app

Level App Measure Bubble Tool Angles Surface Meter Measuring Finder Clinometer Spirit Measurement Accurate Phone Digital Measurements Inclinometer Device Precise Leveling Calibration Easy Free Pitch Surfaces Slopes Compass Perfect Set Display Precision Plumb Recent Laser Target Vertical Objects Length

Google Play Rating history and histogram

Downloads over time

Smart Protractor has been downloaded 5.2 million times. Over the past 30 days, it averaged 260 downloads per day.

Changelog of Smart Protractor

Show changelog

Developer information for Smart Tools co.

Smart Tools co.

androidboy1@gmail.com

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Comments on Smart Protractor for Android

★★★★★ Joe PSB · Mar 21, 2024

Simple app. Allows you to find angles from plumb and has an interactive protractor.

★★★★★ Stewart Angus · Jul 5, 2025

Tried a few other apps, but this one is real easy to use the rest are overcomplicated nonsense when all you need is an easy to understand and use app and this is perfect for the job.

★★★★★ James Marlowe · May 1, 2023

Needed for solar tracker Angle for lenier actuator, 👍

★☆☆☆☆ Logan Harmon · Apr 25, 2024

I swear this app moves the image without your input when using the camera mode. Very frustrating

★☆☆☆☆ Derek Sinclair · Mar 26, 2024

Uninstalled after first attempt to use the camera function, needs to many permissions and hundreds of cookies enabled to work, I gave up after turning off access to 120 tracking cookies and wasn't even a third of the way there.

★☆☆☆☆ Bill Smith · Oct 6, 2025

Absolute garbage. Whenever I wanted to use the app an add took over, and I couldn't even x it out. I couldn't even use the back button to get out of it I had to actually close and reactivate the app, and it started all over again Don't even waste your time.

Google Play Rankings for Smart Protractor

This app is not ranked

Technologies used by Smart Protractor

Smart Protractor is requesting 12 permissions and is using 32 libraries.
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