#FFEF66#FFEF66

#FFEF66 is a very light, vivid yellow. Relative luminance 0.840; OKLCH L 94.0% C 0.156 H 102.7°. Best body text is #000000 at 17.79:1 contrast (WCAG AA passes).

Color values

HEX	#FFEF66
RGB	rgb(255, 239, 102)
HSL	hsl(54, 100%, 70%)
HSV	hsv(54, 60%, 100%)
CMYK	cmyk(0%, 6.3%, 60%, 0%)
CIE-LAB	lab(93.43, -10.66, 66.45)
CIE-LCH	lch(93.43, 67.30, 99.11°)
OKLab	oklab(93.97% -0.0343 0.1524)
OKLCH	oklch(93.97% 0.156 102.7)
XYZ	xyz(74.5075, 83.9551, 24.8481)
Luminance	0.8395 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#FFEF66 #6676FF

analogous

#FFA266 #FFEF66 #C3FF66

triadic

#FFEF66 #66FFEF #EF66FF

tetradic

#FFEF66 #66FFA2 #6676FF #FF66C3

square

#FFEF66 #66FFA2 #6676FF #FF66C3

split-complementary

#FFEF66 #66C3FF #A266FF

monochromatic

#EBD200 #FFE929 #FFEF66 #FFF5A3 #FFFCE0

Accessibility & contrast

On white

1.18

#FFEF66 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

17.79

#FFEF66 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #FFEF66

17.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##FFEF66	#FFFFFF	#000000	##000000
##FFEF66	1.00	1.18	17.79	17.79
#FFFFFF	1.18	1.00	21.00	21.00
#000000	17.79	21.00	1.00	1.00
##000000	17.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFE857

Deuteranopia (green-blind)

#FFEF6D

Tritanopia (blue-blind)

#FFE0D2

Achromatopsia (no color)

#ECECEC

Design tokens & code

CSS

--color: #ffef66;
/* rgb */ color: rgb(255, 239, 102);
/* oklch */ color: oklch(94.0% 0.156 102.7);

Tailwind

colors: {
  custom: {
    50: '#fff497',
    500: '#ffef66',
    950: '#000000',
  },
}

SCSS

$custom: #ffef66;
$custom-light: #fff497;
$custom-dark: #000000;

JSON

{
  "hex": "#ffef66",
  "rgb": {
    "r": 255,
    "g": 239,
    "b": 102
  },
  "hsl": {
    "h": 53.725,
    "s": 100,
    "l": 70
  },
  "oklch": {
    "l": 0.93971,
    "c": 0.15616,
    "h": 102.7
  },
  "luminance": 0.83952
}

Semantic roles & 50–950 ramp

primary

#FFEF66

secondary

#2F41DA

accent

#18E600

background

#FFFFFC

surface

#FFFEF5

border

#D7D6CF

text

#19170E

muted

#87857F

Preview Lab

Preview with #FFEF66

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

Preview Lab → · Contrast checker → · Palette generator →