#EFFF59#EFFF59

#EFFF59 is a very light, vivid yellow. Relative luminance 0.906; OKLCH L 95.9% C 0.184 H 114.6°. Best body text is #000000 at 19.12:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF59
RGB	rgb(239, 255, 89)
HSL	hsl(66, 100%, 67%)
HSV	hsv(66, 65%, 100%)
CMYK	cmyk(6.3%, 0%, 65.1%, 0%)
CIE-LAB	lab(96.24, -25.57, 74.27)
CIE-LCH	lch(96.24, 78.55, 109.00°)
OKLab	oklab(95.88% -0.0768 0.1675)
OKLCH	oklch(95.88% 0.184 114.6)
XYZ	xyz(73.1616, 90.5933, 23.0814)
Luminance	0.9059 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF59 #6959FF

analogous

#FFBC59 #EFFF59 #9CFF59

triadic

#EFFF59 #59EFFF #FF59EF

tetradic

#EFFF59 #59FFBC #6959FF #FF599C

square

#EFFF59 #59FFBC #6959FF #FF599C

split-complementary

#EFFF59 #599CFF #BC59FF

monochromatic

#C8DE00 #E9FF1C #EFFF59 #F5FF96 #FBFFD3

Accessibility & contrast

On white

1.10

#EFFF59 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.12

#EFFF59 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF59

19.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF59	#FFFFFF	#000000	##000000
##EFFF59	1.00	1.10	19.12	19.12
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.12	21.00	1.00	1.00
##000000	19.12	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF341

Deuteranopia (green-blind)

#FFF665

Tritanopia (blue-blind)

#FEF1DD

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff59;
/* rgb */ color: rgb(239, 255, 89);
/* oklch */ color: oklch(95.9% 0.184 114.6);

Tailwind

colors: {
  custom: {
    50: '#f8ff90',
    500: '#efff59',
    950: '#000000',
  },
}

SCSS

$custom: #efff59;
$custom-light: #f8ff90;
$custom-dark: #000000;

JSON

{
  "hex": "#efff59",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 89
  },
  "hsl": {
    "h": 65.783,
    "s": 100,
    "l": 67.451
  },
  "oklch": {
    "l": 0.95881,
    "c": 0.18423,
    "h": 114.6
  },
  "luminance": 0.90592
}

Semantic roles & 50–950 ramp

primary

#EFFF59

secondary

#3726D6

accent

#00E616

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFF59

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

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