If you’re interested in traps, you can add a honeypot to your robots.txt. It comes with some risk of blocking legitimate users, though.

I think you meant print.

Was going to make the same suggestion. You can try it out at https://tinylist.app

Not an app, and I haven’t really used it, but tinylist feels quite Google Keepy. You can add it to your home screen, but it doesn’t seem to work offline.