If the something you are asking about is scripting/modifying, that something might be Shortcuts (or the older Automator). If the something you are asking about

If the something you are asking about is scripting/modifying, that something might be Shortcuts (or the older Automator). If the something you are asking about is a pre-built tool, I would think the menubar is the MacOS place to put a reminder and it looks like someone has built that: https://lifehacker.com/tech/one-thing-app-turns-your-macs-menu-bar-into-sticky-note https://lifehacker.com/tech/one-thing-app-turns-your-macs-me...