#EFF581#EFF581

#EFF581 is a very light, vivid yellow. Relative luminance 0.852; OKLCH L 94.2% C 0.140 H 111.4°. Best body text is #000000 at 18.05:1 contrast (WCAG AA passes).

Color values

HEX	#EFF581
RGB	rgb(239, 245, 129)
HSL	hsl(63, 85%, 73%)
HSV	hsv(63, 47%, 96%)
CMYK	cmyk(2.4%, 0%, 47.3%, 3.9%)
CIE-LAB	lab(93.99, -17.84, 54.73)
CIE-LCH	lch(93.99, 57.57, 108.05°)
OKLab	oklab(94.2% -0.0511 0.1301)
OKLCH	oklch(94.2% 0.14 111.4)
XYZ	xyz(72.2128, 85.2419, 33.4139)
Luminance	0.8524 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFF581 #8781F5

analogous

#F5C181 #EFF581 #B5F581

triadic

#EFF581 #81EFF5 #F581EF

tetradic

#EFF581 #81F5C1 #8781F5 #F581B5

square

#EFF581 #81F5C1 #8781F5 #F581B5

split-complementary

#EFF581 #81B5F5 #C181F5

monochromatic

#DEE913 #E8F048 #EFF581 #F6F9BA #FBFDE3

Accessibility & contrast

On white

1.16

#EFF581 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.05

#EFF581 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFF581

18.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFF581	#FFFFFF	#000000	##000000
##EFF581	1.00	1.16	18.05	18.05
#FFFFFF	1.16	1.00	21.00	21.00
#000000	18.05	21.00	1.00	1.00
##000000	18.05	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFEC77

Deuteranopia (green-blind)

#FFEF87

Tritanopia (blue-blind)

#FCE9DA

Achromatopsia (no color)

#EEEEEE

Design tokens & code

CSS

--color: #eff581;
/* rgb */ color: rgb(239, 245, 129);
/* oklch */ color: oklch(94.2% 0.140 111.4);

Tailwind

colors: {
  custom: {
    50: '#f6f8a8',
    500: '#eff581',
    950: '#000000',
  },
}

SCSS

$custom: #eff581;
$custom-light: #f6f8a8;
$custom-dark: #000000;

JSON

{
  "hex": "#eff581",
  "rgb": {
    "r": 239,
    "g": 245,
    "b": 129
  },
  "hsl": {
    "h": 63.103,
    "s": 85.294,
    "l": 73.333
  },
  "oklch": {
    "l": 0.94195,
    "c": 0.13979,
    "h": 111.4
  },
  "luminance": 0.85241
}

Semantic roles & 50–950 ramp

primary

#EFF581

secondary

#5049D1

accent

#04E20F

background

#FFFFFD

surface

#FFFEF7

border

#D7D6D0

text

#171710

muted

#858581

Preview Lab

Preview with #EFF581

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

Preview Lab → · Contrast checker → · Palette generator →