#EFFF3B#EFFF3B

#EFFF3B is a very light, highly saturated yellow. Relative luminance 0.902; OKLCH L 95.7% C 0.201 H 114.4°. Best body text is #000000 at 19.04:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF3B
RGB	rgb(239, 255, 59)
HSL	hsl(65, 100%, 62%)
HSV	hsv(65, 77%, 100%)
CMYK	cmyk(6.3%, 0%, 76.9%, 0%)
CIE-LAB	lab(96.07, -26.97, 83.99)
CIE-LCH	lch(96.07, 88.21, 107.81°)
OKLab	oklab(95.69% -0.0832 0.1832)
OKLCH	oklch(95.69% 0.201 114.4)
XYZ	xyz(72.1482, 90.1879, 17.7442)
Luminance	0.9019 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF3B #4B3BFF

analogous

#FFAD3B #EFFF3B #8DFF3B

triadic

#EFFF3B #3BEFFF #FF3BEF

tetradic

#EFFF3B #3BFFAD #4B3BFF #FF3B8D

square

#EFFF3B #3BFFAD #4B3BFF #FF3B8D

split-complementary

#EFFF3B #3B8DFF #AD3BFF

monochromatic

#B0C000 #E8FD00 #EFFF3B #F4FF78 #F9FFB5

Accessibility & contrast

On white

1.10

#EFFF3B on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.04

#EFFF3B on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF3B

19.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF3B	#FFFFFF	#000000	##000000
##EFFF3B	1.00	1.10	19.04	19.04
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.04	21.00	1.00	1.00
##000000	19.04	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF200

Deuteranopia (green-blind)

#FFF54D

Tritanopia (blue-blind)

#FFF0DB

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff3b;
/* rgb */ color: rgb(239, 255, 59);
/* oklch */ color: oklch(95.7% 0.201 114.4);

Tailwind

colors: {
  custom: {
    50: '#f9ff81',
    500: '#efff3b',
    950: '#000000',
  },
}

SCSS

$custom: #efff3b;
$custom-light: #f9ff81;
$custom-dark: #000000;

JSON

{
  "hex": "#efff3b",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 59
  },
  "hsl": {
    "h": 64.898,
    "s": 100,
    "l": 61.569
  },
  "oklch": {
    "l": 0.95693,
    "c": 0.20121,
    "h": 114.4
  },
  "luminance": 0.90186
}

Semantic roles & 50–950 ramp

primary

#EFFF3B

secondary

#2E21BD

accent

#00E613

background

#FFFFFC

surface

#FFFFF3

border

#D7D7CD

text

#18170C

muted

#86857F

Preview Lab

Preview with #EFFF3B

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

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