A built-in utility for Windows users that includes measurement and basic highlighting tools.
Purchasing a Pro License directly from the developer unlocks advanced features like lines, rectangles, circles, and the whiteboard/blackboard mode while ensuring your computer stays secure.
For more advanced image editing and drawing, though these are standalone apps rather than screen overlays.
The basic version of Epic Pen is free for anyone to download and includes essential drawing tools like the pen, eraser, and highlighter.