Visionshot looks neat! It looks like there's a few different apps trying to solve a similar set of problems.
Screenotate by Omar Rizwan is the one I used for a while: https://screenotate.com/
Screenotate by Omar Rizwan is the one I used for a while: https://screenotate.com/
Someone recently made dpScreenOCR ( https://danpla.github.io/dpscreenocr/ ) on linux , haven't tried yet