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Recognised as Colour

#66B0CF

  • #66B0CF
  • Cyan
  • Dark
  • Nearest: Sky blue

#66B0CF is a cyan with RGB values 102, 176, 207 and HSL 198°, 52%, 61%. It is a dark colour, so black text on it reaches 8.7:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#66B0CF#66B0CF
HEX#66B0CF
RGBrgb(102, 176, 207)
RGB (0–1)0.4, 0.6902, 0.8118
RGB percentages40%, 69%, 81.2%
HSLhsl(197.7, 52.2%, 60.6%)
HSV / HSBhsv(197.7, 50.7%, 81.2%)
CMYK50.7%, 15%, 0%, 18.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,729,935
CSS custom property--colour: #66B0CF;

Brightness & contrast

Relative luminance0.3838WCAG 2.x, 0 is black and 1 is white
Perceived brightness161.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.68:1
Contrast with white2.42:1WCAG normal text: Fail
Contrast with black8.68:1WCAG normal text: AAA
Greyscale equivalent#A3A3A3
Inverted#994F30

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A0ADD1no red cones; affects about 1% of men; ΔE 18.3 from the original
Deuteranopia#90A1CFno green cones; the most common form, about 1% of men; ΔE 19.5 from the original
Tritanopia#29B9BAno blue cones; rare, and affects men and women equally; ΔE 23.8 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.42:1WCAG large text: Fail
Contrast with black, large text8.68:1WCAG large text: AAA

Named colours

Sky blue · ΔE 11Light skyblue · ΔE 13.3Cadetblue · ΔE 17.7Light steelblue · ΔE 18.4Light blue · ΔE 19.6Deep skyblue · ΔE 20.4
Nearest named CSS colourSky blue (#87CEEB)ΔE 11.02, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CF8566
Analogous#66CFB9, #667CCF
Triadic#CF66B0, #B0CF66
Split complementary#CF667C, #CFB966
Tetradic#B966CF, #CF8566, #7CCF66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#DAECF4
Lighter +20%#B4D8E7
Lighter +10%#8DC4DB
Darker −10%#3F9CC3
Darker −20%#317E9E
Darker −30%#255F77
Darker −40%#194050
More saturated +25%#4DBAE8
Less saturated −25%#7FA6B6

Channel breakdown

R102
G176
B207
Red102 (40%)
Green176 (69%)
Blue207 (81.2%)
Hue197.71°
Saturation (HSL)52.24%
Lightness60.59%
Dominant channelBlue
Hex per channelR 66 · G B0 · B CF

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Every value on this page was computed from “66b0cf” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.