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Recognised as Colour

#66BBF5

  • #66BBF5
  • Blue
  • Dark
  • Nearest: Deep skyblue

#66BBF5 is a blue with RGB values 102, 187, 245 and HSL 204°, 88%, 68%. It is a dark colour, so black text on it reaches 10:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#66BBF5#66BBF5
HEX#66BBF5
RGBrgb(102, 187, 245)
RGB (0–1)0.4, 0.7333, 0.9608
RGB percentages40%, 73.3%, 96.1%
HSLhsl(204.3, 87.7%, 68%)
HSV / HSBhsv(204.3, 58.4%, 96.1%)
CMYK58.4%, 23.7%, 0%, 3.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,732,789
CSS custom property--colour: #66BBF5;

Brightness & contrast

Relative luminance0.44958WCAG 2.x, 0 is black and 1 is white
Perceived brightness174.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.99:1
Contrast with white2.1:1WCAG normal text: Fail
Contrast with black9.99:1WCAG normal text: AAA
Greyscale equivalent#ADADAD
Inverted#99440A

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A1BBF8no red cones; affects about 1% of men; ΔE 15.4 from the original
Deuteranopia#8DACF4no green cones; the most common form, about 1% of men; ΔE 17 from the original
Tritanopia#00C9CFno blue cones; rare, and affects men and women equally; ΔE 36.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.1:1WCAG large text: Fail
Contrast with black, large text9.99:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 10.4Light skyblue · ΔE 10.7Sky blue · ΔE 17.4Steel blue · ΔE 21.5Light steelblue · ΔE 23.4Cornflower blue · ΔE 25
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 10.4, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#F5A066
Analogous#66F5E7, #6674F5
Triadic#F566BB, #BBF566
Split complementary#F56674, #F5E766
Tetradic#E766F5, #F5A066, #74F566

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#F6FBFE
Lighter +20%#C6E6FB
Lighter +10%#96D0F8
Darker −10%#36A6F2
Darker −20%#0F8FE6
Darker −30%#0C71B6
Darker −40%#095386
More saturated +25%#5CBDFF
Less saturated −25%#7AB7E1

Channel breakdown

R102
G187
B245
Red102 (40%)
Green187 (73.3%)
Blue245 (96.1%)
Hue204.34°
Saturation (HSL)87.73%
Lightness68.04%
Dominant channelBlue
Hex per channelR 66 · G BB · B F5

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Every value on this page was computed from “66bbf5” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.