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Recognised as Colour

#666CAA

  • #666CAA
  • Blue
  • Dark
  • Nearest: Steel blue

#666CAA is a blue with RGB values 102, 108, 170 and HSL 235°, 29%, 53%. It is a dark colour, so white text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#666CAA#666CAA
HEX#666CAA
RGBrgb(102, 108, 170)
RGB (0–1)0.4, 0.4235, 0.6667
RGB percentages40%, 42.4%, 66.7%
HSLhsl(234.7, 28.6%, 53.3%)
HSV / HSBhsv(234.7, 40%, 66.7%)
CMYK40%, 36.5%, 0%, 33.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,712,490
CSS custom property--colour: #666CAA;

Brightness & contrast

Relative luminance0.16452WCAG 2.x, 0 is black and 1 is white
Perceived brightness115.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.89:1
Contrast with white4.89:1WCAG normal text: AA
Contrast with black4.29:1WCAG normal text: Fail
Greyscale equivalent#6F6F6F
Inverted#999355

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5773ACno red cones; affects about 1% of men; ΔE 7.7 from the original
Deuteranopia#536EA9no green cones; the most common form, about 1% of men; ΔE 6.6 from the original
Tritanopia#527883no blue cones; rare, and affects men and women equally; ΔE 33.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.89:1WCAG large text: AAA
Contrast with black, large text4.29:1WCAG large text: AA

Named colours

Steel blue · ΔE 18.5Cornflower blue · ΔE 21.5Dark slateblue · ΔE 22.4Slate grey · ΔE 28.7Light slate grey · ΔE 29.1Medium purple · ΔE 29.2
Nearest named CSS colourSteel blue (#4682B4)ΔE 18.49, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AAA466
Analogous#668EAA, #8266AA
Triadic#AA666C, #6CAA66
Split complementary#AA8266, #8EAA66
Tetradic#AA668E, #AAA466, #66AA82

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E9EAF3
Lighter +30%#C8CBE1
Lighter +20%#A8ABCE
Lighter +10%#878BBC
Darker −10%#4F548E
Darker −20%#3D416D
Darker −30%#2B2D4D
Darker −40%#181A2C
More saturated +25%#4853C8
Less saturated −25%#84858C

Channel breakdown

R102
G108
B170
Red102 (40%)
Green108 (42.4%)
Blue170 (66.7%)
Hue234.71°
Saturation (HSL)28.57%
Lightness53.33%
Dominant channelBlue
Hex per channelR 66 · G 6C · B AA

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Every value on this page was computed from “666caa” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.