#EFFC4B#EFFC4B

#EFFC4B is a very light, vivid yellow. Relative luminance 0.885; OKLCH L 95.1% C 0.190 H 113.6°. Best body text is #000000 at 18.70:1 contrast (WCAG AA passes).

Color values

HEX	#EFFC4B
RGB	rgb(239, 252, 75)
HSL	hsl(64, 97%, 64%)
HSV	hsv(64, 70%, 99%)
CMYK	cmyk(5.2%, 0%, 70.2%, 1.2%)
CIE-LAB	lab(95.36, -24.90, 78.40)
CIE-LCH	lch(95.36, 82.25, 107.62°)
OKLab	oklab(95.15% -0.0762 0.174)
OKLCH	oklch(95.15% 0.19 113.6)
XYZ	xyz(71.6791, 88.4810, 19.9579)
Luminance	0.8848 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFC4B #584BFC

analogous

#FCB14B #EFFC4B #97FC4B

triadic

#EFFC4B #4BEFFC #FC4BEF

tetradic

#EFFC4B #4BFCB1 #584BFC #FC4B97

square

#EFFC4B #4BFCB1 #584BFC #FC4B97

split-complementary

#EFFC4B #4B97FC #B14BFC

monochromatic

#BBC903 #EAFB0F #EFFC4B #F4FD87 #FAFEC3

Accessibility & contrast

On white

1.12

#EFFC4B on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.70

#EFFC4B on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFC4B

18.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFC4B	#FFFFFF	#000000	##000000
##EFFC4B	1.00	1.12	18.70	18.70
#FFFFFF	1.12	1.00	21.00	21.00
#000000	18.70	21.00	1.00	1.00
##000000	18.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF02B

Deuteranopia (green-blind)

#FFF359

Tritanopia (blue-blind)

#FFEDDA

Achromatopsia (no color)

#F2F2F2

Design tokens & code

CSS

--color: #effc4b;
/* rgb */ color: rgb(239, 252, 75);
/* oklch */ color: oklch(95.1% 0.190 113.6);

Tailwind

colors: {
  custom: {
    50: '#f8fd88',
    500: '#effc4b',
    950: '#000000',
  },
}

SCSS

$custom: #effc4b;
$custom-light: #f8fd88;
$custom-dark: #000000;

JSON

{
  "hex": "#effc4b",
  "rgb": {
    "r": 239,
    "g": 252,
    "b": 75
  },
  "hsl": {
    "h": 64.407,
    "s": 96.721,
    "l": 64.118
  },
  "oklch": {
    "l": 0.95148,
    "c": 0.18994,
    "h": 113.6
  },
  "luminance": 0.8848
}

Semantic roles & 50–950 ramp

primary

#EFFC4B

secondary

#3226C5

accent

#00E611

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170C

muted

#86857F

Preview Lab

Preview with #EFFC4B

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

Preview Lab → · Contrast checker → · Palette generator →