Hi. Please play this amazing JND color game my friend Keith made and see how good you/your displays are at differentiating between similar colors. https://www.keithcirkel.co.uk/whats-my-jnd/?r=filmgirl
What's My JND?

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

@film_girl

Cheap, 10 year old whatever-monitor I have here. Out of three attempts, the best was 0.0054, which doesn't seem that impressive when seeing some of the other results.

I blame the monitor.