#EFFF52#EFFF52

#EFFF52 is a very light, vivid yellow. Relative luminance 0.905; OKLCH L 95.8% C 0.189 H 114.6°. Best body text is #000000 at 19.10:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF52
RGB	rgb(239, 255, 82)
HSL	hsl(66, 100%, 66%)
HSV	hsv(66, 68%, 100%)
CMYK	cmyk(6.3%, 0%, 67.8%, 0%)
CIE-LAB	lab(96.20, -25.96, 76.79)
CIE-LCH	lch(96.20, 81.06, 108.68°)
OKLab	oklab(95.83% -0.0785 0.1717)
OKLCH	oklch(95.83% 0.189 114.6)
XYZ	xyz(72.8815, 90.4812, 21.6063)
Luminance	0.9048 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF52 #6252FF

analogous

#FFB852 #EFFF52 #98FF52

triadic

#EFFF52 #52EFFF #FF52EF

tetradic

#EFFF52 #52FFB8 #6252FF #FF5298

square

#EFFF52 #52FFB8 #6252FF #FF5298

split-complementary

#EFFF52 #5298FF #B852FF

monochromatic

#C3D700 #E9FF15 #EFFF52 #F5FF8F #FAFFCC

Accessibility & contrast

On white

1.10

#EFFF52 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.10

#EFFF52 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF52

19.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF52	#FFFFFF	#000000	##000000
##EFFF52	1.00	1.10	19.10	19.10
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.10	21.00	1.00	1.00
##000000	19.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF336

Deuteranopia (green-blind)

#FFF65F

Tritanopia (blue-blind)

#FEF1DD

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff52;
/* rgb */ color: rgb(239, 255, 82);
/* oklch */ color: oklch(95.8% 0.189 114.6);

Tailwind

colors: {
  custom: {
    50: '#f8ff8c',
    500: '#efff52',
    950: '#000000',
  },
}

SCSS

$custom: #efff52;
$custom-light: #f8ff8c;
$custom-dark: #000000;

JSON

{
  "hex": "#efff52",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 82
  },
  "hsl": {
    "h": 65.549,
    "s": 100,
    "l": 66.078
  },
  "oklch": {
    "l": 0.95829,
    "c": 0.18881,
    "h": 114.6
  },
  "luminance": 0.9048
}

Semantic roles & 50–950 ramp

primary

#EFFF52

secondary

#3525D0

accent

#00E615

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFF52

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

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