#EFFF08#EFFF08

#EFFF08 is a very light, highly saturated yellow. Relative luminance 0.899; OKLCH L 95.6% C 0.214 H 114.3°. Best body text is #000000 at 18.98:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF08
RGB	rgb(239, 255, 8)
HSL	hsl(64, 100%, 52%)
HSV	hsv(64, 97%, 100%)
CMYK	cmyk(6.3%, 0%, 96.9%, 0%)
CIE-LAB	lab(95.95, -28.02, 92.51)
CIE-LCH	lch(95.95, 96.66, 106.85°)
OKLab	oklab(95.56% -0.0883 0.1955)
OKLCH	oklch(95.56% 0.214 114.3)
XYZ	xyz(71.4029, 89.8898, 13.8188)
Luminance	0.8989 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF08 #1808FF

analogous

#FF9408 #EFFF08 #73FF08

triadic

#EFFF08 #08EFFF #FF08EF

tetradic

#EFFF08 #08FF94 #1808FF #FF0873

square

#EFFF08 #08FF94 #1808FF #FF0873

split-complementary

#EFFF08 #0873FF #9408FF

monochromatic

#838D00 #BDCA00 #EFFF08 #F3FF45 #F7FF82

Accessibility & contrast

On white

1.11

#EFFF08 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.98

#EFFF08 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF08

18.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF08	#FFFFFF	#000000	##000000
##EFFF08	1.00	1.11	18.98	18.98
#FFFFFF	1.11	1.00	21.00	21.00
#000000	18.98	21.00	1.00	1.00
##000000	18.98	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF200

Deuteranopia (green-blind)

#FFF535

Tritanopia (blue-blind)

#FFEFD9

Achromatopsia (no color)

#F3F3F3

Design tokens & code

CSS

--color: #efff08;
/* rgb */ color: rgb(239, 255, 8);
/* oklch */ color: oklch(95.6% 0.214 114.3);

Tailwind

colors: {
  custom: {
    50: '#f9ff73',
    500: '#efff08',
    950: '#000000',
  },
}

SCSS

$custom: #efff08;
$custom-light: #f9ff73;
$custom-dark: #000000;

JSON

{
  "hex": "#efff08",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 8
  },
  "hsl": {
    "h": 63.887,
    "s": 100,
    "l": 51.569
  },
  "oklch": {
    "l": 0.95555,
    "c": 0.21448,
    "h": 114.3
  },
  "luminance": 0.89888
}

Semantic roles & 50–950 ramp

primary

#EFFF08

secondary

#211A92

accent

#29FF37

background

#FFFFFB

surface

#FFFFF2

border

#D7D7CC

text

#18170A

muted

#86857D

Preview Lab

Preview with #EFFF08

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

Preview Lab → · Contrast checker → · Palette generator →