#EFFB66#EFFB66

#EFFB66 is a very light, vivid yellow. Relative luminance 0.883; OKLCH L 95.2% C 0.170 H 113.5°. Best body text is #000000 at 18.66:1 contrast (WCAG AA passes).

Color values

HEX	#EFFB66
RGB	rgb(239, 251, 102)
HSL	hsl(65, 95%, 69%)
HSV	hsv(65, 59%, 98%)
CMYK	cmyk(4.8%, 0%, 59.4%, 1.6%)
CIE-LAB	lab(95.29, -22.86, 68.13)
CIE-LCH	lch(95.29, 71.86, 108.55°)
OKLab	oklab(95.15% -0.0679 0.1563)
OKLCH	oklch(95.15% 0.17 113.5)
XYZ	xyz(72.4938, 88.3057, 25.7936)
Luminance	0.8830 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFB66 #7266FB

analogous

#FBBD66 #EFFB66 #A5FB66

triadic

#EFFB66 #66EFFB #FB66EF

tetradic

#EFFB66 #66FBBD #7266FB #FB66A5

square

#EFFB66 #66FBBD #7266FB #FB66A5

split-complementary

#EFFB66 #66A5FB #BD66FB

monochromatic

#CFE106 #E9F92A #EFFB66 #F5FDA2 #FBFEDD

Accessibility & contrast

On white

1.13

#EFFB66 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.66

#EFFB66 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFB66

18.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFB66	#FFFFFF	#000000	##000000
##EFFB66	1.00	1.13	18.66	18.66
#FFFFFF	1.13	1.00	21.00	21.00
#000000	18.66	21.00	1.00	1.00
##000000	18.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF055

Deuteranopia (green-blind)

#FFF36F

Tritanopia (blue-blind)

#FDEDDB

Achromatopsia (no color)

#F1F1F1

Design tokens & code

CSS

--color: #effb66;
/* rgb */ color: rgb(239, 251, 102);
/* oklch */ color: oklch(95.2% 0.170 113.5);

Tailwind

colors: {
  custom: {
    50: '#f7fc97',
    500: '#effb66',
    950: '#000000',
  },
}

SCSS

$custom: #effb66;
$custom-light: #f7fc97;
$custom-dark: #000000;

JSON

{
  "hex": "#effb66",
  "rgb": {
    "r": 239,
    "g": 251,
    "b": 102
  },
  "hsl": {
    "h": 64.832,
    "s": 94.904,
    "l": 69.216
  },
  "oklch": {
    "l": 0.9515,
    "c": 0.17038,
    "h": 113.5
  },
  "luminance": 0.88304
}

Semantic roles & 50–950 ramp

primary

#EFFB66

secondary

#3D30D5

accent

#00E612

background

#FFFFFC

surface

#FFFFF5

border

#D7D7CF

text

#18170E

muted

#86857F

Preview Lab

Preview with #EFFB66

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

Preview Lab → · Contrast checker → · Palette generator →