Next time you need to remember something important, don’t reach for a sticky note and pen. Instead, reach for the One Thing GNOME extension.
This Linux version of the One Thing app for macOS works in the same way: you enter some text (and yup, emoji is supported too), and whatever you enter appears in the Top Bar (the panel that runs along the top of the screen in a standard GNOME Shell; if you use Dash to Panel, it’ll appear in that).
As concepts go it’s not the most imaginative (so no cries of who copied who), but it doesn’t need to be. Sometimes, all it takes for us to actually get on and do something is to be reminded to do it. This does that, simply.
There are no settings; you can’t customise the font, change text colour, make it blink, flash, or animate in some eye-catching way. You also can’t choose where on the panel the text sits (though this would be handy feature to have). Your “one thing” just stares out at you from the GNOME panel, from beside the Status Menu.
When you no longer need to remember whatever you entered (or more likely, you need to remember something else now), just edit/delete the text as applicable. There are no settings panels to reach for to do it; just click on the text label and the entry field appears, ready to use.
Want to try it out?
You can install the One Thing GNOME extension from the GNOME extension website using a configured web browser or (my preference) the Extension Manager desktop app. You shouldn’t have any issue trying to use it as One Thing works with GNOME 3.36 and above.