#EFFB58#EFFB58

#EFFB58 is a very light, vivid yellow. Relative luminance 0.880; OKLCH L 95.0% C 0.181 H 113.4°. Best body text is #000000 at 18.61:1 contrast (WCAG AA passes).

Color values

HEX	#EFFB58
RGB	rgb(239, 251, 88)
HSL	hsl(64, 95%, 66%)
HSV	hsv(64, 65%, 98%)
CMYK	cmyk(4.8%, 0%, 64.9%, 1.6%)
CIE-LAB	lab(95.18, -23.74, 73.56)
CIE-LCH	lch(95.18, 77.29, 107.89°)
OKLab	oklab(95.03% -0.0718 0.1658)
OKLCH	oklch(95.03% 0.181 113.4)
XYZ	xyz(71.8572, 88.0511, 22.4409)
Luminance	0.8805 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFB58 #6458FB

analogous

#FBB658 #EFFB58 #9EFB58

triadic

#EFFB58 #58EFFB #FB58EF

tetradic

#EFFB58 #58FBB6 #6458FB #FB589E

square

#EFFB58 #58FBB6 #6458FB #FB589E

split-complementary

#EFFB58 #589EFB #B658FB

monochromatic

#C4D405 #E9FA1C #EFFB58 #F5FC94 #FAFED0

Accessibility & contrast

On white

1.13

#EFFB58 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.61

#EFFB58 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFB58

18.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFB58	#FFFFFF	#000000	##000000
##EFFB58	1.00	1.13	18.61	18.61
#FFFFFF	1.13	1.00	21.00	21.00
#000000	18.61	21.00	1.00	1.00
##000000	18.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFEF41

Deuteranopia (green-blind)

#FFF363

Tritanopia (blue-blind)

#FEEDDA

Achromatopsia (no color)

#F1F1F1

Design tokens & code

CSS

--color: #effb58;
/* rgb */ color: rgb(239, 251, 88);
/* oklch */ color: oklch(95.0% 0.181 113.4);

Tailwind

colors: {
  custom: {
    50: '#f8fc8f',
    500: '#effb58',
    950: '#000000',
  },
}

SCSS

$custom: #effb58;
$custom-light: #f8fc8f;
$custom-dark: #000000;

JSON

{
  "hex": "#effb58",
  "rgb": {
    "r": 239,
    "g": 251,
    "b": 88
  },
  "hsl": {
    "h": 64.417,
    "s": 95.322,
    "l": 66.471
  },
  "oklch": {
    "l": 0.9503,
    "c": 0.18067,
    "h": 113.4
  },
  "luminance": 0.8805
}

Semantic roles & 50–950 ramp

primary

#EFFB58

secondary

#3529CE

accent

#00E611

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFB58

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

Preview Lab → · Contrast checker → · Palette generator →