SideNotes

SideNotes is one of those apps that's been quietly living on your screen edge for years—literally since version 3 dropped on Product Hunt. If you've ever needed to jot something down without interrupting your workflow, you know exactly why this exists. It's quick notes that stay out of your way until you need them.

The concept is dead simple: notes that hang out on the side of your screen, ready when you are, invisible when you don't. No more digging through files, no more cmd+tab-ing away from what you're doing. It's the type of tool you forget you're using until you can't work without it. That's the product magic right there.

No funding data, no founder bio, no growth metrics in the system. Just a utility app that's been around long enough to hit version 3—which means people actually pay for it.