xScope 4.3.2 | macOS | 32 mb xScope is powerful set of tools that are ideal for measuring, inspecting, and testing on-screen graphics and layouts. Its tools float above your desktop windows and can be accessed via a toolbar, menubar, and/or hot keys.
Compatibility: macOS 10.10 or later, 64bit
Mac App Store:
https://geo.itunes.apple.com/app/id889428659