#EFFE5B#EFFE5B

#EFFE5B is a very light, vivid yellow. Relative luminance 0.900; OKLCH L 95.7% C 0.182 H 114.4°. Best body text is #000000 at 19.00:1 contrast (WCAG AA passes).

Color values

HEX	#EFFE5B
RGB	rgb(239, 254, 91)
HSL	hsl(66, 99%, 68%)
HSV	hsv(66, 64%, 100%)
CMYK	cmyk(5.9%, 0%, 64.2%, 0.4%)
CIE-LAB	lab(95.99, -24.98, 73.25)
CIE-LCH	lch(95.99, 77.40, 108.83°)
OKLab	oklab(95.69% -0.0749 0.1656)
OKLCH	oklch(95.69% 0.182 114.4)
XYZ	xyz(72.9286, 89.9910, 23.4237)
Luminance	0.8999 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFE5B #6A5BFE

analogous

#FEBB5B #EFFE5B #9EFE5B

triadic

#EFFE5B #5BEFFE #FE5BEF

tetradic

#EFFE5B #5BFEBB #6A5BFE #FE5B9E

square

#EFFE5B #5BFEBB #6A5BFE #FE5B9E

split-complementary

#EFFE5B #5B9EFE #BB5BFE

monochromatic

#C9DD01 #E9FE1E #EFFE5B #F5FE98 #FBFFD5

Accessibility & contrast

On white

1.11

#EFFE5B on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.00

#EFFE5B on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFE5B

19.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFE5B	#FFFFFF	#000000	##000000
##EFFE5B	1.00	1.11	19.00	19.00
#FFFFFF	1.11	1.00	21.00	21.00
#000000	19.00	21.00	1.00	1.00
##000000	19.00	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF245

Deuteranopia (green-blind)

#FFF566

Tritanopia (blue-blind)

#FEF0DD

Achromatopsia (no color)

#F3F3F3

Design tokens & code

CSS

--color: #effe5b;
/* rgb */ color: rgb(239, 254, 91);
/* oklch */ color: oklch(95.7% 0.182 114.4);

Tailwind

colors: {
  custom: {
    50: '#f8fe91',
    500: '#effe5b',
    950: '#000000',
  },
}

SCSS

$custom: #effe5b;
$custom-light: #f8fe91;
$custom-dark: #000000;

JSON

{
  "hex": "#effe5b",
  "rgb": {
    "r": 239,
    "g": 254,
    "b": 91
  },
  "hsl": {
    "h": 65.521,
    "s": 98.788,
    "l": 67.647
  },
  "oklch": {
    "l": 0.95686,
    "c": 0.18178,
    "h": 114.4
  },
  "luminance": 0.8999
}

Semantic roles & 50–950 ramp

primary

#EFFE5B

secondary

#3727D6

accent

#00E615

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFE5B

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

Preview Lab → · Contrast checker → · Palette generator →