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 0.036 on OLED iPhone, 0.0043 on IPS MacBook. I definitely struggled more on the Mac
@arch Got it down to 0.0026 on the phone. Eyes definitely need rest, I'm guessing chemicals in the cones burn out