What's My JND?

Find your Just Noticeable Difference in colour perception. How small a colour difference can you actually see?

0.0041 on my second monitor. Hmmmm.
@arch 0.0047 on my iPhone - it’ll probably be awful on my desktop
@arch apparently managed a 0.0029 on my work Surface at max brightness - pretty sure if I did it again that’d be lower since there were a few lucky guesses