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Recognised as Colour

#3F66AC

  • #3F66AC
  • Blue
  • Dark
  • Nearest: Steel blue

#3F66AC is a blue with RGB values 63, 102, 172 and HSL 219°, 46%, 46%. It is a dark colour, so white text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#3F66AC#3F66AC
HEX#3F66AC
RGBrgb(63, 102, 172)
RGB (0–1)0.2471, 0.4, 0.6745
RGB percentages24.7%, 40%, 67.5%
HSLhsl(218.5, 46.4%, 46.1%)
HSV / HSBhsv(218.5, 63.4%, 67.5%)
CMYK63.4%, 40.7%, 0%, 32.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,155,052
CSS custom property--colour: #3F66AC;

Brightness & contrast

Relative luminance0.13538WCAG 2.x, 0 is black and 1 is white
Perceived brightness103.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 5.66:1
Contrast with white5.66:1WCAG normal text: AA
Contrast with black3.71:1WCAG normal text: Fail
Greyscale equivalent#636363
Inverted#C09953

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#476CAFno red cones; affects about 1% of men; ΔE 3.2 from the original
Deuteranopia#3762ABno green cones; the most common form, about 1% of men; ΔE 2.6 from the original
Tritanopia#007680no blue cones; rare, and affects men and women equally; ΔE 43.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text5.66:1WCAG large text: AAA
Contrast with black, large text3.71:1WCAG large text: AA

Named colours

Steel blue · ΔE 18.3Cornflower blue · ΔE 19.9Dark slateblue · ΔE 21.4Dodgerblue · ΔE 26.9Royal blue · ΔE 29.7Medium purple · ΔE 31.4
Nearest named CSS colourSteel blue (#4682B4)ΔE 18.31, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AC853F
Analogous#3F9DAC, #4F3FAC
Triadic#AC3F66, #66AC3F
Split complementary#AC4E3F, #9DAC3F
Tetradic#AC3F9C, #AC853F, #3FAC4E

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CBD7EC
Lighter +30%#A6BADE
Lighter +20%#809DD1
Lighter +10%#5B80C3
Darker −10%#315087
Darker −20%#243A61
Darker −30%#16243C
Darker −40%#080D17
More saturated +25%#225EC9
Less saturated −25%#5C6E8F

Channel breakdown

R63
G102
B172
Red63 (24.7%)
Green102 (40%)
Blue172 (67.5%)
Hue218.53°
Saturation (HSL)46.38%
Lightness46.08%
Dominant channelBlue
Hex per channelR 3F · G 66 · B AC

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Every value on this page was computed from “3f66ac” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.