#EFFB55#EFFB55

#EFFB55 is a very light, vivid yellow. Relative luminance 0.880; OKLCH L 95.0% C 0.183 H 113.4°. Best body text is #000000 at 18.60:1 contrast (WCAG AA passes).

Color values

HEX	#EFFB55
RGB	rgb(239, 251, 85)
HSL	hsl(64, 95%, 66%)
HSV	hsv(64, 66%, 98%)
CMYK	cmyk(4.8%, 0%, 66.1%, 1.6%)
CIE-LAB	lab(95.16, -23.91, 74.66)
CIE-LCH	lch(95.16, 78.39, 107.76°)
OKLab	oklab(95.01% -0.0725 0.1677)
OKLCH	oklch(95.01% 0.183 113.4)
XYZ	xyz(71.7355, 88.0024, 21.7998)
Luminance	0.8800 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#EFFB55 #6155FB

analogous

#FBB455 #EFFB55 #9CFB55

triadic

#EFFB55 #55EFFB #FB55EF

tetradic

#EFFB55 #55FBB4 #6155FB #FB559C

square

#EFFB55 #55FBB4 #6155FB #FB559C

split-complementary

#EFFB55 #559CFB #B455FB

monochromatic

#C2D105 #E9FA19 #EFFB55 #F5FC91 #FAFECD

Accessibility & contrast

On white

1.13

#EFFB55 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.60

#EFFB55 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #EFFB55

18.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##EFFB55	#FFFFFF	#000000	##000000
##EFFB55	1.00	1.13	18.60	18.60
#FFFFFF	1.13	1.00	21.00	21.00
#000000	18.60	21.00	1.00	1.00
##000000	18.60	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFEF3C

Deuteranopia (green-blind)

#FFF361

Tritanopia (blue-blind)

#FEEDDA

Achromatopsia (no color)

#F1F1F1

Design tokens & code

CSS

--color: #effb55;
/* rgb */ color: rgb(239, 251, 85);
/* oklch */ color: oklch(95.0% 0.183 113.4);

Tailwind

colors: {
  custom: {
    50: '#f8fc8d',
    500: '#effb55',
    950: '#000000',
  },
}

SCSS

$custom: #effb55;
$custom-light: #f8fc8d;
$custom-dark: #000000;

JSON

{
  "hex": "#effb55",
  "rgb": {
    "r": 239,
    "g": 251,
    "b": 85
  },
  "hsl": {
    "h": 64.337,
    "s": 95.402,
    "l": 65.882
  },
  "oklch": {
    "l": 0.95007,
    "c": 0.18269,
    "h": 113.4
  },
  "luminance": 0.88001
}

Semantic roles & 50–950 ramp

primary

#EFFB55

secondary

#3429CC

accent

#00E611

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #EFFB55

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

Preview Lab → · Contrast checker → · Palette generator →