#EFFC66#EFFC66

#EFFC66 is a very light, vivid yellow. Relative luminance 0.889; OKLCH L 95.4% C 0.171 H 113.8°. Best body text is #000000 at 18.79:1 contrast (WCAG AA passes).

Color values

HEX	#EFFC66
RGB	rgb(239, 252, 102)
HSL	hsl(65, 96%, 69%)
HSV	hsv(65, 60%, 99%)
CMYK	cmyk(5.2%, 0%, 59.5%, 1.2%)
CIE-LAB	lab(95.55, -23.34, 68.41)
CIE-LCH	lch(95.55, 72.28, 108.84°)
OKLab	oklab(95.36% -0.0693 0.1569)
OKLCH	oklch(95.36% 0.171 113.8)
XYZ	xyz(72.8070, 88.9321, 25.8980)
Luminance	0.8893 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFC66 #7366FC

analogous

#FCBE66 #EFFC66 #A4FC66

triadic

#EFFC66 #66EFFC #FC66EF

tetradic

#EFFC66 #66FCBE #7366FC #FC66A4

square

#EFFC66 #66FCBE #7366FC #FC66A4

split-complementary

#EFFC66 #66A4FC #BE66FC

monochromatic

#D0E304 #E9FB2A #EFFC66 #F5FDA2 #FCFEDE

Accessibility & contrast

On white

1.12

#EFFC66 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.79

#EFFC66 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFC66

18.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFC66	#FFFFFF	#000000	##000000
##EFFC66	1.00	1.12	18.79	18.79
#FFFFFF	1.12	1.00	21.00	21.00
#000000	18.79	21.00	1.00	1.00
##000000	18.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF154

Deuteranopia (green-blind)

#FFF46F

Tritanopia (blue-blind)

#FDEEDC

Achromatopsia (no color)

#F2F2F2

Design tokens & code

CSS

--color: #effc66;
/* rgb */ color: rgb(239, 252, 102);
/* oklch */ color: oklch(95.4% 0.171 113.8);

Tailwind

colors: {
  custom: {
    50: '#f7fd97',
    500: '#effc66',
    950: '#000000',
  },
}

SCSS

$custom: #effc66;
$custom-light: #f7fd97;
$custom-dark: #000000;

JSON

{
  "hex": "#effc66",
  "rgb": {
    "r": 239,
    "g": 252,
    "b": 102
  },
  "hsl": {
    "h": 65.2,
    "s": 96.154,
    "l": 69.412
  },
  "oklch": {
    "l": 0.9536,
    "c": 0.17147,
    "h": 113.8
  },
  "luminance": 0.88931
}

Semantic roles & 50–950 ramp

primary

#EFFC66

secondary

#3E30D6

accent

#00E614

background

#FFFFFC

surface

#FFFFF5

border

#D7D7CF

text

#18170E

muted

#86857F

Preview Lab

Preview with #EFFC66

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

Preview Lab → · Contrast checker → · Palette generator →