#3F4166
Prussian Blue · dark cool blue
About #3F4166
#3F4166 is a muted, dark shade in the blue family. On screen it is built from 25% red, 25% green and 40% blue; for print, its CMYK mix is 38% cyan, 36% magenta, 0% yellow and 60% black. Its overall feel is cool.
Of the common colour names it is similar to Prussian Blue (ΔE 13.9); Oxford Blue comes next. Its complementary colour, directly opposite on the colour wheel, is #66643F — a coffee tone that gives the strongest contrast in hue.
Designers tend to use dark tones like #3F4166 for headings, body text, footers and dark-mode backgrounds. White text reads best on it at 9.73:1 (a WCAG AAA pass). Used as a text colour on white, it is readable too (9.73:1).
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Closest named colours
ΔE measures visible difference: under 2 is barely noticeable, over 10 is clearly different.
Text on #3F4166
WCAG contrast for white and black text on this colour.
Colour-blindness preview
How #3F4166 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 #3F4166?
#3F4166 is a muted, dark shade in the blue family. On screen it is built from 25% red, 25% green and 40% blue; for print, its CMYK mix is 38% cyan, 36% magenta, 0% yellow and 60% black. Its overall feel is cool.
›What text colour should I use on #3F4166?
Use white text. White on #3F4166 has a contrast ratio of 9.73:1 (AAA).
›What colours go with #3F4166?
Its complementary colour is #66643F, and analogous partners are #3F5466 and #503F66.