Angle measuring protractor. With no additional fees, this app is free. It doesn't even have any advertising.

With this app, you will be able to:
It has a pause button and a camera view.
You can calculate the angle formed by two markers.
Plumb lines, both horizontally and vertically. Tap once to snap the nearest marker to the line, twice to track, and once more to release.
If the plumb lines are off, press the CAL button to calibrate the accelerometer.
To the clipboard, copy the angle in both degrees and radians.
Get the measurements on the go, no need to bring your traditional protractor.

Download this very functional app on your device now.