Colour
#EFFF66
- #EFFF66
- Yellow
- Light
- Nearest: Yellow green
#EFFF66 is a yellow with RGB values 239, 255, 102 and HSL 66°, 100%, 70%. It is a light colour, so black text on it reaches 19.2:1 contrast (AAA for normal text). The nearest named colour is Yellow green.
Colour values
#EFFF66#EFFF66
HEX#EFFF66
RGBrgb(239, 255, 102)
RGB (0–1)0.9373, 1, 0.4
RGB percentages93.7%, 100%, 40%
HSLhsl(66.3, 100%, 70%)
HSV / HSBhsv(66.3, 60%, 100%)
CMYK6.3%, 0%, 60%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,728,486
CSS custom property--colour: #EFFF66;
Brightness & contrast
Relative luminance0.9083WCAG 2.x, 0 is black and 1 is white
Perceived brightness237.6 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 19.17:1
Contrast with white1.1:1WCAG normal text: Fail
Contrast with black19.17:1WCAG normal text: AAA
Greyscale equivalent#F1F1F1
Inverted#100099
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text1.1:1WCAG large text: Fail
Contrast with black, large text19.17:1WCAG large text: AAA
Named colours
Hue familyyellow
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#7666FF
Analogous#FFC266, #A3FF66
Triadic#66EFFF, #FF66EF
Split complementary#66A3FF, #C266FF
Tetradic#66FFC2, #7666FF, #FF66A3
Tints, shades & saturation
Channel breakdown
R239
G255
B102
Red239 (93.7%)
Green255 (100%)
Blue102 (40%)
Hue66.27°
Saturation (HSL)100%
Lightness70%
Dominant channelGreen
Hex per channelR EF · G FF · B 66
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