#EFEF55#EFEF55

#EFEF55 is a very light, vivid yellow. Relative luminance 0.807; OKLCH L 92.5% C 0.171 H 109.3°. Best body text is #000000 at 17.15:1 contrast (WCAG AA passes).

Color values

HEX	#EFEF55
RGB	rgb(239, 239, 85)
HSL	hsl(60, 83%, 64%)
HSV	hsv(60, 64%, 94%)
CMYK	cmyk(0%, 0%, 64.4%, 6.3%)
CIE-LAB	lab(92.02, -18.17, 71.44)
CIE-LCH	lch(92.02, 73.71, 104.27°)
OKLab	oklab(92.49% -0.0564 0.1609)
OKLCH	oklch(92.49% 0.171 109.3)
XYZ	xyz(68.1050, 80.7415, 20.5897)
Luminance	0.8074 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFEF55 #5555EF

analogous

#EFA255 #EFEF55 #A2EF55

triadic

#EFEF55 #55EFEF #EF55EF

tetradic

#EFEF55 #55EFA2 #5555EF #EF55A2

square

#EFEF55 #55EFA2 #5555EF #EF55A2

split-complementary

#EFEF55 #55A2EF #A255EF

monochromatic

#B8B811 #EAEA1D #EFEF55 #F4F48D #FAFAC5

Accessibility & contrast

On white

1.22

#EFEF55 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

17.15

#EFEF55 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFEF55

17.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFEF55	#FFFFFF	#000000	##000000
##EFEF55	1.00	1.22	17.15	17.15
#FFFFFF	1.22	1.00	21.00	21.00
#000000	17.15	21.00	1.00	1.00
##000000	17.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFE540

Deuteranopia (green-blind)

#FFEA5F

Tritanopia (blue-blind)

#FFE0D0

Achromatopsia (no color)

#E8E8E8

Design tokens & code

CSS

--color: #efef55;
/* rgb */ color: rgb(239, 239, 85);
/* oklch */ color: oklch(92.5% 0.171 109.3);

Tailwind

colors: {
  custom: {
    50: '#f8f48c',
    500: '#efef55',
    950: '#000000',
  },
}

SCSS

$custom: #efef55;
$custom-light: #f8f48c;
$custom-dark: #000000;

JSON

{
  "hex": "#efef55",
  "rgb": {
    "r": 239,
    "g": 239,
    "b": 85
  },
  "hsl": {
    "h": 60,
    "s": 82.796,
    "l": 63.529
  },
  "oklch": {
    "l": 0.92492,
    "c": 0.17051,
    "h": 109.3
  },
  "luminance": 0.8074
}

Semantic roles & 50–950 ramp

primary

#EFEF55

secondary

#3131B7

accent

#06DF06

background

#FFFFFC

surface

#FFFEF4

border

#D7D6CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFEF55

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

Preview Lab → · Contrast checker → · Palette generator →