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Colour

#66A5FF

  • #66A5FF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#66A5FF is a blue with RGB values 102, 165, 255 and HSL 215°, 100%, 70%. It is a dark colour, so black text on it reaches 8.4:1 contrast (AAA for normal text). The nearest named colour is Cornflower blue.

Colour values

#66A5FF#66A5FF
HEX#66A5FF
RGBrgb(102, 165, 255)
RGB (0–1)0.4, 0.6471, 1
RGB percentages40%, 64.7%, 100%
HSLhsl(215.3, 100%, 70%)
HSV / HSBhsv(215.3, 60%, 100%)
CMYK60%, 35.3%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,727,167
CSS custom property--colour: #66A5FF;

Brightness & contrast

Relative luminance0.36955WCAG 2.x, 0 is black and 1 is white
Perceived brightness162.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.39:1
Contrast with white2.5:1WCAG normal text: Fail
Contrast with black8.39:1WCAG normal text: AAA
Greyscale equivalent#9E9E9E
Inverted#995A00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7FACFFno red cones; affects about 1% of men; ΔE 6 from the original
Deuteranopia#6A9DFDno green cones; the most common form, about 1% of men; ΔE 5.6 from the original
Tritanopia#00B9C6no blue cones; rare, and affects men and women equally; ΔE 51.9 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.5:1WCAG large text: Fail
Contrast with black, large text8.39:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 6.3Dodgerblue · ΔE 15.4Deep skyblue · ΔE 25.8Steel blue · ΔE 25.9Light skyblue · ΔE 30.7Royal blue · ΔE 31.5
Nearest named CSS colourCornflower blue (#6495ED)ΔE 6.33, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFC066
Analogous#66F2FF, #7366FF
Triadic#FF66A5, #A5FF66
Split complementary#FF7466, #F1FF66
Tetradic#FF66F2, #FFC066, #66FF74

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FFFFFF
Lighter +20%#CCE1FF
Lighter +10%#99C3FF
Darker −10%#3387FF
Darker −20%#0069FF
Darker −30%#0054CC
Darker −40%#003F99
More saturated +25%#66A5FF
Less saturated −25%#79A8EC

Channel breakdown

R102
G165
B255
Red102 (40%)
Green165 (64.7%)
Blue255 (100%)
Hue215.29°
Saturation (HSL)100%
Lightness70%
Dominant channelBlue
Hex per channelR 66 · G A5 · B FF

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Every value on this page was computed from “66a5ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.