#EFFB57#EFFB57

#EFFB57 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	#EFFB57
RGB	rgb(239, 251, 87)
HSL	hsl(64, 95%, 66%)
HSV	hsv(64, 65%, 98%)
CMYK	cmyk(4.8%, 0%, 65.3%, 1.6%)
CIE-LAB	lab(95.18, -23.80, 73.93)
CIE-LCH	lch(95.18, 77.66, 107.85°)
OKLab	oklab(95.02% -0.072 0.1664)
OKLCH	oklch(95.02% 0.181 113.4)
XYZ	xyz(71.8161, 88.0346, 22.2242)
Luminance	0.8803 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFB57 #6357FB

analogous

#FBB557 #EFFB57 #9DFB57

triadic

#EFFB57 #57EFFB #FB57EF

tetradic

#EFFB57 #57FBB5 #6357FB #FB579D

square

#EFFB57 #57FBB5 #6357FB #FB579D

split-complementary

#EFFB57 #579DFB #B557FB

monochromatic

#C4D305 #E9FA1B #EFFB57 #F5FC93 #FAFECF

Accessibility & contrast

On white

1.13

#EFFB57 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.61

#EFFB57 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFB57

18.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFB57	#FFFFFF	#000000	##000000
##EFFB57	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)

#FFEF40

Deuteranopia (green-blind)

#FFF363

Tritanopia (blue-blind)

#FEEDDA

Achromatopsia (no color)

#F1F1F1

Design tokens & code

CSS

--color: #effb57;
/* rgb */ color: rgb(239, 251, 87);
/* oklch */ color: oklch(95.0% 0.181 113.4);

Tailwind

colors: {
  custom: {
    50: '#f8fc8f',
    500: '#effb57',
    950: '#000000',
  },
}

SCSS

$custom: #effb57;
$custom-light: #f8fc8f;
$custom-dark: #000000;

JSON

{
  "hex": "#effb57",
  "rgb": {
    "r": 239,
    "g": 251,
    "b": 87
  },
  "hsl": {
    "h": 64.39,
    "s": 95.349,
    "l": 66.275
  },
  "oklch": {
    "l": 0.95022,
    "c": 0.18135,
    "h": 113.4
  },
  "luminance": 0.88033
}

Semantic roles & 50–950 ramp

primary

#EFFB57

secondary

#3529CD

accent

#00E611

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFB57

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

Preview Lab → · Contrast checker → · Palette generator →