#EFFF55#EFFF55

#EFFF55 is a very light, vivid yellow. Relative luminance 0.905; OKLCH L 95.9% C 0.187 H 114.6°. Best body text is #000000 at 19.11:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF55
RGB	rgb(239, 255, 85)
HSL	hsl(66, 100%, 67%)
HSV	hsv(66, 67%, 100%)
CMYK	cmyk(6.3%, 0%, 66.7%, 0%)
CIE-LAB	lab(96.22, -25.80, 75.72)
CIE-LCH	lch(96.22, 80.00, 108.81°)
OKLab	oklab(95.85% -0.0778 0.1699)
OKLCH	oklch(95.85% 0.187 114.6)
XYZ	xyz(72.9982, 90.5279, 22.2207)
Luminance	0.9053 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF55 #6555FF

analogous

#FFBA55 #EFFF55 #9AFF55

triadic

#EFFF55 #55EFFF #FF55EF

tetradic

#EFFF55 #55FFBA #6555FF #FF559A

square

#EFFF55 #55FFBA #6555FF #FF559A

split-complementary

#EFFF55 #559AFF #BA55FF

monochromatic

#C5DA00 #E9FF18 #EFFF55 #F5FF92 #FBFFCF

Accessibility & contrast

On white

1.10

#EFFF55 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.11

#EFFF55 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF55

19.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF55	#FFFFFF	#000000	##000000
##EFFF55	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)

#FFF33B

Deuteranopia (green-blind)

#FFF661

Tritanopia (blue-blind)

#FEF1DD

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff55;
/* rgb */ color: rgb(239, 255, 85);
/* oklch */ color: oklch(95.9% 0.187 114.6);

Tailwind

colors: {
  custom: {
    50: '#f8ff8e',
    500: '#efff55',
    950: '#000000',
  },
}

SCSS

$custom: #efff55;
$custom-light: #f8ff8e;
$custom-dark: #000000;

JSON

{
  "hex": "#efff55",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 85
  },
  "hsl": {
    "h": 65.647,
    "s": 100,
    "l": 66.667
  },
  "oklch": {
    "l": 0.95851,
    "c": 0.18689,
    "h": 114.6
  },
  "luminance": 0.90527
}

Semantic roles & 50–950 ramp

primary

#EFFF55

secondary

#3625D3

accent

#00E616

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFF55

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

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