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The active vs inactive checkmarks are very difficult to tell apart on this site:

active check inactive check

When I'm scrolling down the page it's hard to tell which answer I've actually accepted (or if there is one). Yesterday I genuinely mistook the inactive check for being an active check on an answer, and I have good eyesight without colour blindness.

They both look greyish upon the yellow background.

Their contrast ratio with regards to each other is 1.1:1, or in other words their visual contrast is next to nonexistent.

(On a checker that gives us an extra decimal place, their contrast ratio is 1.07:1. The colours used are #598a1e and #818185.)


Since someone asked I thought I'd catalog what the above image pair looks like to color blindness based on simulation from ChromeLens:

protonopia deuteranopia

Left: Protonopia, red color blindness. / Right: deuteranopia, green color blindness.
These are the two most common forms of dichromatic color blindness.

tritanopia anachromatopsia

Left: Tritanopia, blue color blindness. / Right: Anachromatopsia, total color blindness.

  • 3
    It's been on my mind for a long time, but never thought about asking it here. +10 to your question, if I could. – NVZ May 24 '17 at 15:32
  • 1
    Mobile app instead of web experience for the win! – Dan Bron May 24 '17 at 18:06
  • I wonder if colorblindness would exacerbate this. – aparente001 May 24 '17 at 18:44
  • 1
    @aparente001 I added some colour blindness simulation screenshots. (Pretty sure the answer is yes.) – doppelgreener May 25 '17 at 13:02
  • 3
    Maybe outline would be a viable replacement for a non-accepted check? Filled in for marked and empty outline for not marked. – Hank May 25 '17 at 14:41
  • @Hank That would work extremely well. – doppelgreener May 25 '17 at 15:07
  • Has anyone found a similar post on SE meta? – Hank May 25 '17 at 15:25
  • 1
    This post leads me to believe we may be able to control the design here instead of overall. – Hank May 25 '17 at 15:27
  • 1
  • @KitZ.Fox That was asked 5 years ago! And yet it remains a request unimplemented. I had upvoted that post months ago. – NVZ May 25 '17 at 20:35

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