Create a Quark
A drawing, an image or a line of text, up to about 1 KB, written on Quantus for good.
Next free number …
How Quarks workDrag or tap to draw; the same ink again erases. Keys: 1 and 2 for inks, E to erase, ⌘Z or Ctrl+Z to undo. Use arrow keys to move between pixels, and Space to paint.