#EFFD66#EFFD66

#EFFD66 is a very light, vivid yellow. Relative luminance 0.896; OKLCH L 95.6% C 0.173 H 114.1°. Best body text is #000000 at 18.91:1 contrast (WCAG AA passes).

Color values

HEX	#EFFD66
RGB	rgb(239, 253, 102)
HSL	hsl(66, 97%, 70%)
HSV	hsv(66, 60%, 99%)
CMYK	cmyk(5.5%, 0%, 59.7%, 0.8%)
CIE-LAB	lab(95.81, -23.81, 68.70)
CIE-LCH	lch(95.81, 72.71, 109.12°)
OKLab	oklab(95.57% -0.0706 0.1575)
OKLCH	oklch(95.57% 0.173 114.1)
XYZ	xyz(73.1218, 89.5619, 26.0030)
Luminance	0.8956 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFD66 #7466FD

analogous

#FDC066 #EFFD66 #A4FD66

triadic

#EFFD66 #66EFFD #FD66EF

tetradic

#EFFD66 #66FDC0 #7466FD #FD66A4

square

#EFFD66 #66FDC0 #7466FD #FD66A4

split-complementary

#EFFD66 #66A4FD #C066FD

monochromatic

#D1E603 #E9FC2A #EFFD66 #F5FEA2 #FCFFDF

Accessibility & contrast

On white

1.11

#EFFD66 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.91

#EFFD66 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFD66

18.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFD66	#FFFFFF	#000000	##000000
##EFFD66	1.00	1.11	18.91	18.91
#FFFFFF	1.11	1.00	21.00	21.00
#000000	18.91	21.00	1.00	1.00
##000000	18.91	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF254

Deuteranopia (green-blind)

#FFF470

Tritanopia (blue-blind)

#FDEFDD

Achromatopsia (no color)

#F3F3F3

Design tokens & code

CSS

--color: #effd66;
/* rgb */ color: rgb(239, 253, 102);
/* oklch */ color: oklch(95.6% 0.173 114.1);

Tailwind

colors: {
  custom: {
    50: '#f7fe97',
    500: '#effd66',
    950: '#000000',
  },
}

SCSS

$custom: #effd66;
$custom-light: #f7fe97;
$custom-dark: #000000;

JSON

{
  "hex": "#effd66",
  "rgb": {
    "r": 239,
    "g": 253,
    "b": 102
  },
  "hsl": {
    "h": 65.563,
    "s": 97.419,
    "l": 69.608
  },
  "oklch": {
    "l": 0.9557,
    "c": 0.17257,
    "h": 114.1
  },
  "luminance": 0.89561
}

Semantic roles & 50–950 ramp

primary

#EFFD66

secondary

#3F2FD8

accent

#00E615

background

#FFFFFC

surface

#FFFFF5

border

#D7D7CF

text

#18170E

muted

#86857F

Preview Lab

Preview with #EFFD66

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

Preview Lab → · Contrast checker → · Palette generator →