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Recognised as Colour

#66A3FF

  • #66A3FF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#66A3FF is a blue with RGB values 102, 163, 255 and HSL 216°, 100%, 70%. It is a dark colour, so black text on it reaches 8.2:1 contrast (AAA for normal text). The nearest named colour is Cornflower blue.

Colour values

#66A3FF#66A3FF
HEX#66A3FF
RGBrgb(102, 163, 255)
RGB (0–1)0.4, 0.6392, 1
RGB percentages40%, 63.9%, 100%
HSLhsl(216.1, 100%, 70%)
HSV / HSBhsv(216.1, 60%, 100%)
CMYK60%, 36.1%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,726,655
CSS custom property--colour: #66A3FF;

Brightness & contrast

Relative luminance0.36239WCAG 2.x, 0 is black and 1 is white
Perceived brightness161.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.25:1
Contrast with white2.55:1WCAG normal text: Fail
Contrast with black8.25:1WCAG normal text: AAA
Greyscale equivalent#9D9D9D
Inverted#995C00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7CAAFFno red cones; affects about 1% of men; ΔE 5.6 from the original
Deuteranopia#679CFDno green cones; the most common form, about 1% of men; ΔE 4.5 from the original
Tritanopia#00B8C5no blue cones; rare, and affects men and women equally; ΔE 53.3 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.55:1WCAG large text: Fail
Contrast with black, large text8.25:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 5.7Dodgerblue · ΔE 14.1Steel blue · ΔE 26.6Deep skyblue · ΔE 27.2Royal blue · ΔE 30Medium purple · ΔE 31.7
Nearest named CSS colourCornflower blue (#6495ED)ΔE 5.65, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFC266
Analogous#66EFFF, #7666FF
Triadic#FF66A3, #A3FF66
Split complementary#FF7666, #EFFF66
Tetradic#FF66EF, #FFC266, #66FF76

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FFFFFF
Lighter +20%#CCE0FF
Lighter +10%#99C2FF
Darker −10%#3384FF
Darker −20%#0066FF
Darker −30%#0051CC
Darker −40%#003D99
More saturated +25%#66A3FF
Less saturated −25%#79A7EC

Channel breakdown

R102
G163
B255
Red102 (40%)
Green163 (63.9%)
Blue255 (100%)
Hue216.08°
Saturation (HSL)100%
Lightness70%
Dominant channelBlue
Hex per channelR 66 · G A3 · B FF

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Every value on this page was computed from “66a3ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.