>> for some reason my first two fingernails grow funny.. the curve is perfect for it
When I'm counting tomato seeds for a swap that expects a certain number of seeds per packet, I use a small, stemless cordial glass that has a sort of double curve or "belly" in its side. When I tilt it to 45 degrees, all the seeds come up to that "belly", but I have to drag them one-by-one or in small lots up the remaining slope and over the edge. That makes them very easy too count even for very clumsy fingers.