For some reason at above 1600px wide the content starts to shrink and become unreadable.
Not affiliated in any way, just a big fan of any tool that lets me quickly explain or document something. I'd say about 99% of bug tickets I enter into our ticketing tool have a CleanShotX screenshot attached (or video).
Here is an example of a handful of the tools (numbers, text, boxes, arrows, highlight area, and redact): https://cs.joshstrange.com/kSpsv7DG