#EFFF63#EFFF63

#EFFF63 is a very light, vivid yellow. Relative luminance 0.908; OKLCH L 96.0% C 0.177 H 114.7°. Best body text is #000000 at 19.15:1 contrast (WCAG AA passes).

Color values

HEX	#EFFF63
RGB	rgb(239, 255, 99)
HSL	hsl(66, 100%, 69%)
HSV	hsv(66, 61%, 100%)
CMYK	cmyk(6.3%, 0%, 61.2%, 0%)
CIE-LAB	lab(96.32, -24.96, 70.46)
CIE-LCH	lch(96.32, 74.75, 109.50°)
OKLab	oklab(95.96% -0.0741 0.1608)
OKLCH	oklch(95.96% 0.177 114.7)
XYZ	xyz(73.6104, 90.7728, 25.4451)
Luminance	0.9077 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFF63 #7363FF

analogous

#FFC163 #EFFF63 #A1FF63

triadic

#EFFF63 #63EFFF #FF63EF

tetradic

#EFFF63 #63FFC1 #7363FF #FF63A1

square

#EFFF63 #63FFC1 #7363FF #FF63A1

split-complementary

#EFFF63 #63A1FF #C163FF

monochromatic

#D0E800 #E9FF26 #EFFF63 #F5FFA0 #FCFFDD

Accessibility & contrast

On white

1.10

#EFFF63 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.15

#EFFF63 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFF63

19.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFF63	#FFFFFF	#000000	##000000
##EFFF63	1.00	1.10	19.15	19.15
#FFFFFF	1.10	1.00	21.00	21.00
#000000	19.15	21.00	1.00	1.00
##000000	19.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF350

Deuteranopia (green-blind)

#FFF66D

Tritanopia (blue-blind)

#FDF1DE

Achromatopsia (no color)

#F4F4F4

Design tokens & code

CSS

--color: #efff63;
/* rgb */ color: rgb(239, 255, 99);
/* oklch */ color: oklch(96.0% 0.177 114.7);

Tailwind

colors: {
  custom: {
    50: '#f7ff96',
    500: '#efff63',
    950: '#000000',
  },
}

SCSS

$custom: #efff63;
$custom-light: #f7ff96;
$custom-dark: #000000;

JSON

{
  "hex": "#efff63",
  "rgb": {
    "r": 239,
    "g": 255,
    "b": 99
  },
  "hsl": {
    "h": 66.154,
    "s": 100,
    "l": 69.412
  },
  "oklch": {
    "l": 0.95964,
    "c": 0.17706,
    "h": 114.7
  },
  "luminance": 0.90772
}

Semantic roles & 50–950 ramp

primary

#EFFF63

secondary

#3E2CDA

accent

#00E618

background

#FFFFFC

surface

#FFFFF5

border

#D7D7CF

text

#18170E

muted

#86857F

Preview Lab

Preview with #EFFF63

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

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