Smart Protractor, developed by Smart Tools co., is a free Android app that belongs to the Utilities & Tools category. It allows users to measure the angle and slope of an object with ease. The app has three protractor modes, including touch mode, plumb mode, and camera mode, which makes it a versatile tool for different purposes.

In touch mode, users can measure the angle of an object by placing it on the screen and touching it. Plumb mode, on the other hand, shows the slope of the device by using a weight. Camera mode uses the camera view to measure the angle and slope of an object.

The app has several main features, including tilt units (degree, percent, radian), zero calibration, and orientation sensor on/off. It also has a material design that makes it easy to use. The pro version of the app offers additional features such as no ads, various tilt units, screen capture, ruler, level, and thread pitch.

If you need more tools, you can download the Smart Ruler Pro and Smart Tools package. For more information, you can watch YouTube videos or visit the blog. Overall, Smart Protractor is a convenient tool for measuring angles and slopes that is easy to use and provides accurate results.