Screen Protractor is described as 'Allows you to easily and quickly measure any angle on the screen to the nearest Degree or Radian' and is an app. There are 2 alternatives to Screen Protractor for Windows, Linux, PortableApps.com, SaaS and Mac. The best Screen Protractor alternative is PicPick. It's not free, so if you're looking for a free alternative, you could try PicPick or OnScreenProtractor.
Provides versatile screen capture options, built-in image annotation, color picking and palette, precision measurement tools like ruler and protractor, hotkey customization, clipboard and multi-format support, simple tray access, sharing, and portable operation.
On-Screen Protractor is a simple java application that allows to measure an angle on the screen. The background of the application window is transparent and can be placed over any other window, e.g. a map. It's very customisable.
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