Maybe you've created your own AR program for wearables that shows the definition of a word when you highlight it IRL, or you've built a personal calendar app for your family to display on a monitor in the kitchen. Whatever it is, I'd love to hear it.
Glad you found it useful. Yes it should qualify and I wanted to make it a bit meta :). However I think https://thoughtful3.eth.limo is more interesting out of things I've built for myself. It's an onchain Twitter. I am currently using it as my personal microblog - however anyone could use it too if they wanted to to burn a few cents per post.