#EFFB5B#EFFB5B

#EFFB5B is a very light, vivid yellow. Relative luminance 0.881; OKLCH L 95.1% C 0.179 H 113.4°. Best body text is #000000 at 18.62:1 contrast (WCAG AA passes).

Color values

HEX	#EFFB5B
RGB	rgb(239, 251, 91)
HSL	hsl(65, 95%, 67%)
HSV	hsv(65, 64%, 98%)
CMYK	cmyk(4.8%, 0%, 63.7%, 1.6%)
CIE-LAB	lab(95.20, -23.57, 72.43)
CIE-LCH	lch(95.20, 76.17, 108.02°)
OKLab	oklab(95.05% -0.071 0.1639)
OKLCH	oklch(95.05% 0.179 113.4)
XYZ	xyz(71.9840, 88.1018, 23.1089)
Luminance	0.8810 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFB5B #675BFB

analogous

#FBB75B #EFFB5B #9FFB5B

triadic

#EFFB5B #5BEFFB #FB5BEF

tetradic

#EFFB5B #5BFBB7 #675BFB #FB5B9F

square

#EFFB5B #5BFBB7 #675BFB #FB5B9F

split-complementary

#EFFB5B #5B9FFB #B75BFB

monochromatic

#C7D605 #E9FA1F #EFFB5B #F5FC97 #FBFED2

Accessibility & contrast

On white

1.13

#EFFB5B on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.62

#EFFB5B on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFB5B

18.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFB5B	#FFFFFF	#000000	##000000
##EFFB5B	1.00	1.13	18.62	18.62
#FFFFFF	1.13	1.00	21.00	21.00
#000000	18.62	21.00	1.00	1.00
##000000	18.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF045

Deuteranopia (green-blind)

#FFF366

Tritanopia (blue-blind)

#FEEDDA

Achromatopsia (no color)

#F1F1F1

Design tokens & code

CSS

--color: #effb5b;
/* rgb */ color: rgb(239, 251, 91);
/* oklch */ color: oklch(95.1% 0.179 113.4);

Tailwind

colors: {
  custom: {
    50: '#f7fc91',
    500: '#effb5b',
    950: '#000000',
  },
}

SCSS

$custom: #effb5b;
$custom-light: #f7fc91;
$custom-dark: #000000;

JSON

{
  "hex": "#effb5b",
  "rgb": {
    "r": 239,
    "g": 251,
    "b": 91
  },
  "hsl": {
    "h": 64.5,
    "s": 95.238,
    "l": 67.059
  },
  "oklch": {
    "l": 0.95054,
    "c": 0.17859,
    "h": 113.4
  },
  "luminance": 0.881
}

Semantic roles & 50–950 ramp

primary

#EFFB5B

secondary

#362AD1

accent

#00E611

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFB5B

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

Preview Lab → · Contrast checker → · Palette generator →