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Colour

#666AAC

  • #666AAC
  • Blue
  • Dark
  • Nearest: Dark slateblue

#666AAC is a blue with RGB values 102, 106, 172 and HSL 237°, 30%, 54%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Dark slateblue.

Colour values

#666AAC#666AAC
HEX#666AAC
RGBrgb(102, 106, 172)
RGB (0–1)0.4, 0.4157, 0.6745
RGB percentages40%, 41.6%, 67.5%
HSLhsl(236.6, 29.7%, 53.7%)
HSV / HSBhsv(236.6, 40.7%, 67.5%)
CMYK40.7%, 38.4%, 0%, 32.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,711,980
CSS custom property--colour: #666AAC;

Brightness & contrast

Relative luminance0.16111WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.97:1
Contrast with white4.97:1WCAG normal text: AA
Contrast with black4.22:1WCAG normal text: Fail
Greyscale equivalent#6E6E6E
Inverted#999553

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5372AFno red cones; affects about 1% of men; ΔE 8.9 from the original
Deuteranopia#4F6DAAno green cones; the most common form, about 1% of men; ΔE 8.3 from the original
Tritanopia#517783no blue cones; rare, and affects men and women equally; ΔE 35.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.97:1WCAG large text: AAA
Contrast with black, large text4.22:1WCAG large text: AA

Named colours

Dark slateblue · ΔE 20.4Steel blue · ΔE 20.6Cornflower blue · ΔE 21Medium purple · ΔE 26.8Slate blue · ΔE 30.1Dodgerblue · ΔE 30.7
Nearest named CSS colourDark slateblue (#483D8B)ΔE 20.41, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#ACA866
Analogous#668DAC, #8566AC
Triadic#AC666A, #6AAC66
Split complementary#AC8566, #8DAC66
Tetradic#AC668D, #ACA866, #66AC85

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EAEBF4
Lighter +30%#C9CBE2
Lighter +20%#A8AAD0
Lighter +10%#878ABE
Darker −10%#4E5291
Darker −20%#3C3F70
Darker −30%#2B2D4E
Darker −40%#191A2D
More saturated +25%#4950CA
Less saturated −25%#84848F

Channel breakdown

R102
G106
B172
Red102 (40%)
Green106 (41.6%)
Blue172 (67.5%)
Hue236.57°
Saturation (HSL)29.66%
Lightness53.73%
Dominant channelBlue
Hex per channelR 66 · G 6A · B AC

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