The best thing about paper sticky notes is that they’re sticky — that is, you can easily attach them to another sheet of paper, to a computer, to a wall, whatever. and then detach and move them when necessary. I want a digital version of that. That is, I want the ability to create a digital sticky note and attach it to any file on my computer — so that when I open a particular PDF, for instance, I see the sticky on the page to which I have attached it. Ditto with a text file or a photo or a movie — any file. I’d like each note to have the features that Stickies on the Mac have: multiple background colors, rich text, live links, and a clickable title bar that shrinks the note. Oh, I’d also like this on iOS, and there it should be possible to create handwritten stickies with an Apple Pencil.
Ideally each sticky note would have an ID that’s representable in a link, so you could put in one note attached to a file a link to another note attached to another file.
Because of the way Apple sandboxes apps these days such a thing could probably be created only by Apple itself, and that’s not going to happen. Still, a guy can dream. Such a feature would be incredibly useful to me.