#ECFF42#ECFF42

#ECFF42 is a very light, vivid yellow. Relative luminance 0.897; OKLCH L 95.5% C 0.199 H 115.4°. Best body text is #000000 at 18.95:1 contrast (WCAG AA passes).

Color values

HEX	#ECFF42
RGB	rgb(236, 255, 66)
HSL	hsl(66, 100%, 63%)
HSV	hsv(66, 74%, 100%)
CMYK	cmyk(7.5%, 0%, 74.1%, 0%)
CIE-LAB	lab(95.89, -27.90, 81.71)
CIE-LCH	lch(95.89, 86.34, 108.85°)
OKLab	oklab(95.5% -0.0851 0.1796)
OKLCH	oklch(95.5% 0.199 115.4)
XYZ	xyz(71.3374, 89.7474, 18.7182)
Luminance	0.8975 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#ECFF42 #5542FF

analogous

#FFB442 #ECFF42 #8DFF42

triadic

#ECFF42 #42ECFF #FF42EC

tetradic

#ECFF42 #42FFB4 #5542FF #FF428D

square

#ECFF42 #42FFB4 #5542FF #FF428D

split-complementary

#ECFF42 #428DFF #B442FF

monochromatic

#B3C700 #E6FF05 #ECFF42 #F2FF7F #F8FFBC

Accessibility & contrast

On white

1.11

#ECFF42 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.95

#ECFF42 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #ECFF42

18.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##ECFF42	#FFFFFF	#000000	##000000
##ECFF42	1.00	1.11	18.95	18.95
#FFFFFF	1.11	1.00	21.00	21.00
#000000	18.95	21.00	1.00	1.00
##000000	18.95	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF212

Deuteranopia (green-blind)

#FFF553

Tritanopia (blue-blind)

#FBF0DB

Achromatopsia (no color)

#F3F3F3

Design tokens & code

CSS

--color: #ecff42;
/* rgb */ color: rgb(236, 255, 66);
/* oklch */ color: oklch(95.5% 0.199 115.4);

Tailwind

colors: {
  custom: {
    50: '#f6ff84',
    500: '#ecff42',
    950: '#000000',
  },
}

SCSS

$custom: #ecff42;
$custom-light: #f6ff84;
$custom-dark: #000000;

JSON

{
  "hex": "#ecff42",
  "rgb": {
    "r": 236,
    "g": 255,
    "b": 66
  },
  "hsl": {
    "h": 66.032,
    "s": 100,
    "l": 62.941
  },
  "oklch": {
    "l": 0.95503,
    "c": 0.19875,
    "h": 115.4
  },
  "luminance": 0.89746
}

Semantic roles & 50–950 ramp

primary

#ECFF42

secondary

#3322C3

accent

#00E617

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170C

muted

#86857F

Preview Lab

Preview with #ECFF42

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

Preview Lab → · Contrast checker → · Palette generator →