Apps similar to Screen Protractor include PicPick, which is free for personal use. Other options are OnScreenProtractor and Nexmetra. In total there are three Color Picker Tools like Screen Protractor for Windows, Linux, the web and Mac.
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.
South Korea
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.
Nexmetra is a collection of four free, browser-based measurement tools built for accuracy and simplicity — no ads, no sign-up, no downloads.
India
