Colour
#66FFFF
- #66FFFF
- Cyan
- Light
- Nearest: Aqua
#66FFFF is a cyan with RGB values 102, 255, 255 and HSL 180°, 100%, 70%. It is a light colour, so black text on it reaches 17.3:1 contrast (AAA for normal text). The nearest named colour is Aqua.
Colour values
#66FFFF#66FFFF
HEX#66FFFF
HEX (short)#6FF
RGBrgb(102, 255, 255)
RGB (0–1)0.4, 1, 1
RGB percentages40%, 100%, 100%
HSLhsl(180, 100%, 70%)
HSV / HSBhsv(180, 60%, 100%)
CMYK60%, 0%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,750,207
CSS custom property--colour: #66FFFF;
Brightness & contrast
Relative luminance0.81565WCAG 2.x, 0 is black and 1 is white
Perceived brightness220.7 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 17.31:1
Contrast with white1.21:1WCAG normal text: Fail
Contrast with black17.31:1WCAG normal text: AAA
Greyscale equivalent#DEDEDE
Inverted#990000
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.21:1WCAG large text: Fail
Contrast with black, large text17.31:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#FF6666
Analogous#66FFB3, #66B3FF
Triadic#FF66FF, #FFFF66
Split complementary#FF66B3, #FFB366
Tetradic#B366FF, #FF6666, #B3FF66
Tints, shades & saturation
Channel breakdown
R102
G255
B255
Red102 (40%)
Green255 (100%)
Blue255 (100%)
Hue180°
Saturation (HSL)100%
Lightness70%
Dominant channelGreen and Blue
Hex per channelR 66 · G FF · B FF
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