#3F4366
Prussian Blue · dark cool blue
About #3F4366
#3F4366 is a dark, muted blue colour. Digitally that works out to 25% red, 26% green and 40% blue. In CMYK print terms it is 38% cyan, 34% magenta, 0% yellow and 60% black. Most people will perceive it as cool.
Visually it is similar to Prussian Blue (ΔE 13.7), with Charcoal the next nearest named colour. Across the colour wheel sits #66623F (coffee), its complementary partner.
Because it is dark, it is most useful for headings, body text, footers and dark-mode backgrounds. White text reads best on it at 9.52:1 (a WCAG AAA pass). Used as a text colour on white, it is readable too (9.52:1).
Colour codes
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Closest named colours
ΔE measures visible difference: under 2 is barely noticeable, over 10 is clearly different.
Text on #3F4366
WCAG contrast for white and black text on this colour.
Colour-blindness preview
How #3F4366 appears to people with the three most common types of colour-vision deficiency.
Shades, tints & matching colours
Similar colours
Frequently asked questions
›What colour is #3F4366?
#3F4366 is a dark, muted blue colour. Digitally that works out to 25% red, 26% green and 40% blue. In CMYK print terms it is 38% cyan, 34% magenta, 0% yellow and 60% black. Most people will perceive it as cool.
›What text colour should I use on #3F4366?
Use white text. White on #3F4366 has a contrast ratio of 9.52:1 (AAA).
›What colours go with #3F4366?
Its complementary colour is #66623F, and analogous partners are #3F5766 and #4E3F66.