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Recognised as Colour

#666FA1

  • #666FA1
  • Blue
  • Dark
  • Nearest: Steel blue

#666FA1 is a blue with RGB values 102, 111, 161 and HSL 231°, 24%, 52%. It is a dark colour, so white text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Steel blue.

Colour values

#666FA1#666FA1
HEX#666FA1
RGBrgb(102, 111, 161)
RGB (0–1)0.4, 0.4353, 0.6314
RGB percentages40%, 43.5%, 63.1%
HSLhsl(230.8, 23.9%, 51.6%)
HSV / HSBhsv(230.8, 36.6%, 63.1%)
CMYK36.6%, 31.1%, 0%, 36.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,713,249
CSS custom property--colour: #666FA1;

Brightness & contrast

Relative luminance0.16767WCAG 2.x, 0 is black and 1 is white
Perceived brightness115.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.82:1
Contrast with white4.82:1WCAG normal text: AA
Contrast with black4.35:1WCAG normal text: Fail
Greyscale equivalent#717171
Inverted#99905E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5F74A3no red cones; affects about 1% of men; ΔE 4.6 from the original
Deuteranopia#5B70A0no green cones; the most common form, about 1% of men; ΔE 4.1 from the original
Tritanopia#557981no blue cones; rare, and affects men and women equally; ΔE 27.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.82:1WCAG large text: AAA
Contrast with black, large text4.35:1WCAG large text: AA

Named colours

Steel blue · ΔE 14.7Slate grey · ΔE 21.4Light slate grey · ΔE 22Cornflower blue · ΔE 25.4Dark slateblue · ΔE 27.8Dim grey · ΔE 29.7
Nearest named CSS colourSteel blue (#4682B4)ΔE 14.67, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#A19866
Analogous#668DA1, #7A66A1
Triadic#A1666F, #6FA166
Split complementary#A17A66, #8DA166
Tetradic#A1668D, #A19866, #66A17A

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E4E6EF
Lighter +30%#C5C8DB
Lighter +20%#A5AAC8
Lighter +10%#868DB4
Darker −10%#515883
Darker −20%#3D4364
Darker −30%#2A2E44
Darker −40%#161925
More saturated +25%#475AC0
Less saturated −25%#848484

Channel breakdown

R102
G111
B161
Red102 (40%)
Green111 (43.5%)
Blue161 (63.1%)
Hue230.85°
Saturation (HSL)23.89%
Lightness51.57%
Dominant channelBlue
Hex per channelR 66 · G 6F · B A1

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Every value on this page was computed from “666fa1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.