#EFFF99#EFFF99

#EFFF99 is a very light, vivid yellow. Relative luminance 0.922; OKLCH L 96.6% C 0.127 H 116.1°. Best body text is #000000 at 19.43:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF99
RGB	rgb(239, 255, 153)
HSL	hsl(69, 100%, 80%)
HSV	hsv(69, 40%, 100%)
CMYK	cmyk(6.3%, 0%, 40%, 0%)
CIE-LAB	lab(96.89, -20.27, 46.93)
CIE-LCH	lch(96.89, 51.12, 113.36°)
OKLab	oklab(96.61% -0.056 0.1142)
OKLCH	oklch(96.61% 0.127 116.1)
XYZ	xyz(77.1069, 92.1713, 43.8597)
Luminance	0.9217 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF99 #A999FF

analogous

#FFDC99 #EFFF99 #BCFF99

triadic

#EFFF99 #99EFFF #FF99EF

tetradic

#EFFF99 #99FFDC #A999FF #FF99BC

square

#EFFF99 #99FFDC #A999FF #FF99BC

split-complementary

#EFFF99 #99BCFF #DC99FF

monochromatic

#DCFF1F #E5FF5C #EFFF99 #F9FFD6 #FAFFE0

Accessibility & contrast

On white

1.08

#EFFF99 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.43

#EFFF99 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF99

19.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF99	#FFFFFF	#000000	##000000
##EFFF99	1.00	1.08	19.43	19.43
#FFFFFF	1.08	1.00	21.00	21.00
#000000	19.43	21.00	1.00	1.00
##000000	19.43	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF591

Deuteranopia (green-blind)

#FFF79E

Tritanopia (blue-blind)

#F9F5E6

Achromatopsia (no color)

#F6F6F6

Design tokens & code

CSS

--color: #efff99;
/* rgb */ color: rgb(239, 255, 153);
/* oklch */ color: oklch(96.6% 0.127 116.1);

Tailwind

colors: {
  custom: {
    50: '#f5ffb8',
    500: '#efff99',
    950: '#000000',
  },
}

SCSS

$custom: #efff99;
$custom-light: #f5ffb8;
$custom-dark: #000000;

JSON

{
  "hex": "#efff99",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 153
  },
  "hsl": {
    "h": 69.412,
    "s": 100,
    "l": 80
  },
  "oklch": {
    "l": 0.96609,
    "c": 0.12723,
    "h": 116.1
  },
  "luminance": 0.92171
}

Semantic roles & 50–950 ramp

primary

#EFFF99

secondary

#705AE2

accent

#00E624

background

#FFFFFD

surface

#FFFFF8

border

#D7D7D1

text

#171811

muted

#858681

Preview Lab

Preview with #EFFF99

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

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