Built by Ashes, for the express purpose of quickly counting stitches (and later, rows; scope creep) while crocheting near a computer.

Keyboard button effects via Keyboard CSS by Dharmen Shah.

I designed the simple counter to use a keyboard (reach over, hit a button, keep doing), with the following key actions. If you're on mobile, these functions are all on-screen (but I suppose you could also use a keyboard on mobile).