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Recognised as Colour

#66B1FF

  • #66B1FF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#66B1FF is a blue with RGB values 102, 177, 255 and HSL 211°, 100%, 70%. It is a dark colour, so black text on it reaches 9.3:1 contrast (AAA for normal text). The nearest named colour is Cornflower blue.

Colour values

#66B1FF#66B1FF
HEX#66B1FF
RGBrgb(102, 177, 255)
RGB (0–1)0.4, 0.6941, 1
RGB percentages40%, 69.4%, 100%
HSLhsl(210.6, 100%, 70%)
HSV / HSBhsv(210.6, 60%, 100%)
CMYK60%, 30.6%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,730,239
CSS custom property--colour: #66B1FF;

Brightness & contrast

Relative luminance0.41489WCAG 2.x, 0 is black and 1 is white
Perceived brightness170 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.3:1
Contrast with white2.26:1WCAG normal text: Fail
Contrast with black9.3:1WCAG normal text: AAA
Greyscale equivalent#A7A7A7
Inverted#994E00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#90B5FFno red cones; affects about 1% of men; ΔE 9.1 from the original
Deuteranopia#7BA6FDno green cones; the most common form, about 1% of men; ΔE 10.3 from the original
Tritanopia#00C3CDno blue cones; rare, and affects men and women equally; ΔE 46 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.26:1WCAG large text: Fail
Contrast with black, large text9.3:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 13.6Deep skyblue · ΔE 17.5Light skyblue · ΔE 21.9Steel blue · ΔE 22.7Dodgerblue · ΔE 23.5Sky blue · ΔE 29.5
Nearest named CSS colourCornflower blue (#6495ED)ΔE 13.64, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFB466
Analogous#66FDFF, #6866FF
Triadic#FF66B1, #B1FF66
Split complementary#FF6866, #FDFF66
Tetradic#FF66FD, #FFB466, #66FF68

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FFFFFF
Lighter +20%#CCE5FF
Lighter +10%#99CBFF
Darker −10%#3397FF
Darker −20%#007DFF
Darker −30%#0064CC
Darker −40%#004B99
More saturated +25%#66B1FF
Less saturated −25%#79B1EC

Channel breakdown

R102
G177
B255
Red102 (40%)
Green177 (69.4%)
Blue255 (100%)
Hue210.59°
Saturation (HSL)100%
Lightness70%
Dominant channelBlue
Hex per channelR 66 · G B1 · B FF

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Every value on this page was computed from “66b1ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.