Rindraw

Most apps flatten what you draw into pixels the moment you lift the Pencil. Rindraw doesn't. Every stroke stays a stroke: recolor it next week, bend it, scale it up, and it stays sharp, because Rindraw draws it again instead of stretching it.

Your history stays too. Quit, come back days later, and undo still goes back.

And it's yours in plainer ways: you pay once for iPad, iPhone and Mac, each drawing is a file you can see in Files, there's no account, and Rindraw collects nothing.