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Colour

#668AA1

  • #668AA1
  • Blue
  • Dark
  • Nearest: Light slate grey

#668AA1 is a blue with RGB values 102, 138, 161 and HSL 203°, 24%, 52%. It is a dark colour, so black text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Light slate grey.

Colour values

#668AA1#668AA1
HEX#668AA1
RGBrgb(102, 138, 161)
RGB (0–1)0.4, 0.5412, 0.6314
RGB percentages40%, 54.1%, 63.1%
HSLhsl(203.4, 23.9%, 51.6%)
HSV / HSBhsv(203.4, 36.6%, 63.1%)
CMYK36.6%, 14.3%, 0%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,720,161
CSS custom property--colour: #668AA1;

Brightness & contrast

Relative luminance0.23575WCAG 2.x, 0 is black and 1 is white
Perceived brightness131.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.71:1
Contrast with white3.67:1WCAG normal text: Fail
Contrast with black5.71:1WCAG normal text: AA
Greyscale equivalent#848484
Inverted#99755E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#8089A2no red cones; affects about 1% of men; ΔE 9.2 from the original
Deuteranopia#7882A1no green cones; the most common form, about 1% of men; ΔE 10.3 from the original
Tritanopia#529091no blue cones; rare, and affects men and women equally; ΔE 16.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.67:1WCAG large text: AA
Contrast with black, large text5.71:1WCAG large text: AAA

Named colours

Light slate grey · ΔE 6.7Slate grey · ΔE 7.7Steel blue · ΔE 16.5Cadetblue · ΔE 16.7Gray · ΔE 17.6Dim grey · ΔE 20.8
Nearest named CSS colourLight slate grey (#778899)ΔE 6.72, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A17D66
Analogous#66A19B, #666DA1
Triadic#A1668A, #8AA166
Split complementary#A1666D, #A19B66
Tetradic#9B66A1, #A17D66, #6CA166

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E4EBEF
Lighter +30%#C5D2DB
Lighter +20%#A5BAC8
Lighter +10%#86A2B4
Darker −10%#517083
Darker −20%#3D5564
Darker −30%#2A3A44
Darker −40%#161F25
More saturated +25%#4791C0
Less saturated −25%#848484

Channel breakdown

R102
G138
B161
Red102 (40%)
Green138 (54.1%)
Blue161 (63.1%)
Hue203.39°
Saturation (HSL)23.89%
Lightness51.57%
Dominant channelBlue
Hex per channelR 66 · G 8A · B A1

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Every value on this page was computed from “668aa1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.