#EFFF56#EFFF56

#EFFF56 is a very light, vivid yellow. Relative luminance 0.905; OKLCH L 95.9% C 0.186 H 114.6°. Best body text is #000000 at 19.11:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF56
RGB	rgb(239, 255, 86)
HSL	hsl(66, 100%, 67%)
HSV	hsv(66, 66%, 100%)
CMYK	cmyk(6.3%, 0%, 66.3%, 0%)
CIE-LAB	lab(96.22, -25.74, 75.36)
CIE-LCH	lch(96.22, 79.64, 108.86°)
OKLab	oklab(95.86% -0.0775 0.1693)
OKLCH	oklch(95.86% 0.186 114.6)
XYZ	xyz(73.0382, 90.5439, 22.4315)
Luminance	0.9054 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF56 #6656FF

analogous

#FFBA56 #EFFF56 #9BFF56

triadic

#EFFF56 #56EFFF #FF56EF

tetradic

#EFFF56 #56FFBA #6656FF #FF569B

square

#EFFF56 #56FFBA #6656FF #FF569B

split-complementary

#EFFF56 #569BFF #BA56FF

monochromatic

#C6DB00 #E9FF19 #EFFF56 #F5FF93 #FBFFD0

Accessibility & contrast

On white

1.10

#EFFF56 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.11

#EFFF56 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF56

19.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF56	#FFFFFF	#000000	##000000
##EFFF56	1.00	1.10	19.11	19.11
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.11	21.00	1.00	1.00
##000000	19.11	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF33D

Deuteranopia (green-blind)

#FFF662

Tritanopia (blue-blind)

#FEF1DD

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff56;
/* rgb */ color: rgb(239, 255, 86);
/* oklch */ color: oklch(95.9% 0.186 114.6);

Tailwind

colors: {
  custom: {
    50: '#f8ff8e',
    500: '#efff56',
    950: '#000000',
  },
}

SCSS

$custom: #efff56;
$custom-light: #f8ff8e;
$custom-dark: #000000;

JSON

{
  "hex": "#efff56",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 86
  },
  "hsl": {
    "h": 65.68,
    "s": 100,
    "l": 66.863
  },
  "oklch": {
    "l": 0.95858,
    "c": 0.18624,
    "h": 114.6
  },
  "luminance": 0.90543
}

Semantic roles & 50–950 ramp

primary

#EFFF56

secondary

#3625D4

accent

#00E616

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFF56

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

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