ScreenFloat

A screenshot is just a screenshot. Until you use ScreenFloat.

Not everyone wants to subscribe to a Screenshot utility like CleanShot X, but may be looking for more than Apple's built-in tool can do. Then (and not only then) ScreenFloat is  a great choice: "With ScreenFloat, you can capture and record your screen in various ways, and re-capture previous areas effortlessly."

eternalstorms.at/ScreenFloat/