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Recognised as Colour

#668AD3

  • #668AD3
  • Blue
  • Dark
  • Nearest: Cornflower blue

#668AD3 is a blue with RGB values 102, 138, 211 and HSL 220°, 55%, 61%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#668AD3#668AD3
HEX#668AD3
RGBrgb(102, 138, 211)
RGB (0–1)0.4, 0.5412, 0.8275
RGB percentages40%, 54.1%, 82.7%
HSLhsl(220.2, 55.3%, 61.4%)
HSV / HSBhsv(220.2, 51.7%, 82.7%)
CMYK51.7%, 34.6%, 0%, 17.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,720,211
CSS custom property--colour: #668AD3;

Brightness & contrast

Relative luminance0.25705WCAG 2.x, 0 is black and 1 is white
Perceived brightness139.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.14:1
Contrast with white3.42:1WCAG normal text: Fail
Contrast with black6.14:1WCAG normal text: AA
Greyscale equivalent#888888
Inverted#99752C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6D90D6no red cones; affects about 1% of men; ΔE 3 from the original
Deuteranopia#6186D1no green cones; the most common form, about 1% of men; ΔE 2 from the original
Tritanopia#319AA5no blue cones; rare, and affects men and women equally; ΔE 43.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.42:1WCAG large text: AA
Contrast with black, large text6.14:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 9Steel blue · ΔE 16.1Dodgerblue · ΔE 22.1Deep skyblue · ΔE 29.6Medium purple · ΔE 30.2Royal blue · ΔE 31.6
Nearest named CSS colourCornflower blue (#6495ED)ΔE 9.03, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D3AF66
Analogous#66C0D3, #7966D3
Triadic#D3668A, #8AD366
Split complementary#D37966, #C1D366
Tetradic#D366C0, #D3AF66, #66D379

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#DDE5F5
Lighter +20%#B5C7EA
Lighter +10%#8EA8DE
Darker −10%#3E6CC8
Darker −20%#2F56A4
Darker −30%#24417C
Darker −40%#182C55
More saturated +25%#4D82EC
Less saturated −25%#7F92BA

Channel breakdown

R102
G138
B211
Red102 (40%)
Green138 (54.1%)
Blue211 (82.7%)
Hue220.18°
Saturation (HSL)55.33%
Lightness61.37%
Dominant channelBlue
Hex per channelR 66 · G 8A · B D3

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Every value on this page was computed from “668ad3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.