Smart Protractor
Tools Contains ads
Measure the angle and slope of an object with your device.
- Rating
- 4.0
- 18.1K ratings
- Downloads
- 5.1M+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Jun 2
- 2026 · v1.6.4
Screenshots
About Smart Protractor
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.
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.
What’s new
Version 1.6.4 · Updated June 2, 2026
- v1.6.4 : More models have been calibrated - v1.6.2 : Support for Android 16
User reviews
Good app
Maknyus
This is a great little aid for checking angles, especially useful for getting your circular saw blades set up correctly.
Love it used to setup the suspension on my 4x4
Works great
Great App, does exactly what it says without clutter. 3 modes each useful for variety of tasks, drawing and measurement based. Interesting use of your phones camera to impose protractor image over. Haven't really tested this mode much, but was pleased to discover this ability and can see numerous situations where th...
Alternatives to Smart Protractor
Looking for apps like Smart Protractor? Here are 3 similar Android apps on Google Play. The highest rated is Compass Steel 3D (4.7/5), and all 3 are free to download.
| App | Rating | Price | Installs | Last updated | Compare |
|---|---|---|---|---|---|
| Smart Protractor | 4.0 / 5 | Free | 5,000,000+ | Jun 2, 2026 | |
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| Compass Steel 3D | 4.7 / 5 | Free | 5,000,000+ | Oct 11, 2026 | Compare |
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