#EFFF66#EFFF66

#EFFF66 is a very light, vivid yellow. Relative luminance 0.908; OKLCH L 96.0% C 0.175 H 114.8°. Best body text is #000000 at 19.17:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF66
RGB	rgb(239, 255, 102)
HSL	hsl(66, 100%, 70%)
HSV	hsv(66, 60%, 100%)
CMYK	cmyk(6.3%, 0%, 60%, 0%)
CIE-LAB	lab(96.34, -24.76, 69.27)
CIE-LCH	lch(96.34, 73.56, 109.67°)
OKLab	oklab(95.99% -0.0732 0.1587)
OKLCH	oklch(95.99% 0.175 114.8)
XYZ	xyz(73.7565, 90.8312, 26.2146)
Luminance	0.9083 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF66 #7666FF

analogous

#FFC366 #EFFF66 #A2FF66

triadic

#EFFF66 #66EFFF #FF66EF

tetradic

#EFFF66 #66FFC3 #7666FF #FF66A2

square

#EFFF66 #66FFC3 #7666FF #FF66A2

split-complementary

#EFFF66 #66A2FF #C366FF

monochromatic

#D2EB00 #E9FF29 #EFFF66 #F5FFA3 #FCFFE0

Accessibility & contrast

On white

1.10

#EFFF66 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.17

#EFFF66 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF66

19.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF66	#FFFFFF	#000000	##000000
##EFFF66	1.00	1.10	19.17	19.17
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.17	21.00	1.00	1.00
##000000	19.17	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF354

Deuteranopia (green-blind)

#FFF670

Tritanopia (blue-blind)

#FDF1DF

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff66;
/* rgb */ color: rgb(239, 255, 102);
/* oklch */ color: oklch(96.0% 0.175 114.8);

Tailwind

colors: {
  custom: {
    50: '#f7ff97',
    500: '#efff66',
    950: '#000000',
  },
}

SCSS

$custom: #efff66;
$custom-light: #f7ff97;
$custom-dark: #000000;

JSON

{
  "hex": "#efff66",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 102
  },
  "hsl": {
    "h": 66.275,
    "s": 100,
    "l": 70
  },
  "oklch": {
    "l": 0.95991,
    "c": 0.17477,
    "h": 114.8
  },
  "luminance": 0.9083
}

Semantic roles & 50–950 ramp

primary

#EFFF66

secondary

#412FDA

accent

#00E618

background

#FFFFFC

surface

#FFFFF5

border

#D7D7CF

text

#18170E

muted

#86857F

Preview Lab

Preview with #EFFF66

Body copy rendered with the generated semantic roles for this colour.

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