grim

>like I have a script that OCR a region of the screen when I press a button (the coordinates depend of the app that runs) This is easy to do. Something like grim to take the screenshot of whatever region you want: https://github.com/emersion/grim And calculate the coordinates you need by querying the window manager. In sway (i3 compatible tiling WM) that would be: $ swaymsg -t get_tree To get a JSON of all the windows currently open and do whatever math is needed. You can also do a hand selection using slurp: https://github.com/emersion/slurp It works together with grim like this: $ grim -g "$(slurp)" screenshot.png Having recently moved from X to Wayland there are still some things missing sometimes but they're not many. If you want a DE at least GNOME and I think KDE as well are making the switch reasonably seamless. And there are some