Thanks for the great feedback! You’re totally right. I agree with you. drawing over apps can feel sketchy, and using the clipboard definitely adds some friction.
I actually chose this approach because changing people's keyboard habits is a much bigger challenge. I wanted users to keep using their favorite keyboards without forcing them to switch to a new one. I actually made this application for myself, then I saw that people need something like this and I shared with my friends and they like so much that I wanted to make an appropriate application and share this. :) thanks again.