#ECFF40#ECFF40

#ECFF40 is a very light, vivid yellow. Relative luminance 0.897; OKLCH L 95.5% C 0.200 H 115.3°. Best body text is #000000 at 18.94:1 contrast (WCAG AA passes).

Color values

HEX	#ECFF40
RGB	rgb(236, 255, 64)
HSL	hsl(66, 100%, 63%)
HSV	hsv(66, 75%, 100%)
CMYK	cmyk(7.5%, 0%, 74.9%, 0%)
CIE-LAB	lab(95.88, -27.98, 82.30)
CIE-LCH	lch(95.88, 86.93, 108.78°)
OKLab	oklab(95.49% -0.0855 0.1805)
OKLCH	oklch(95.49% 0.2 115.3)
XYZ	xyz(71.2795, 89.7242, 18.4131)
Luminance	0.8972 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#ECFF40 #5340FF

analogous

#FFB340 #ECFF40 #8CFF40

triadic

#ECFF40 #40ECFF #FF40EC

tetradic

#ECFF40 #40FFB3 #5340FF #FF408C

square

#ECFF40 #40FFB3 #5340FF #FF408C

split-complementary

#ECFF40 #408CFF #B340FF

monochromatic

#B1C500 #E6FF03 #ECFF40 #F2FF7D #F8FFBA

Accessibility & contrast

On white

1.11

#ECFF40 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.94

#ECFF40 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #ECFF40

18.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##ECFF40	#FFFFFF	#000000	##000000
##ECFF40	1.00	1.11	18.94	18.94
#FFFFFF	1.11	1.00	21.00	21.00
#000000	18.94	21.00	1.00	1.00
##000000	18.94	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF208

Deuteranopia (green-blind)

#FFF551

Tritanopia (blue-blind)

#FBF0DB

Achromatopsia (no color)

#F3F3F3

Design tokens & code

CSS

--color: #ecff40;
/* rgb */ color: rgb(236, 255, 64);
/* oklch */ color: oklch(95.5% 0.200 115.3);

Tailwind

colors: {
  custom: {
    50: '#f6ff83',
    500: '#ecff40',
    950: '#000000',
  },
}

SCSS

$custom: #ecff40;
$custom-light: #f6ff83;
$custom-dark: #000000;

JSON

{
  "hex": "#ecff40",
  "rgb": {
    "r": 236,
    "g": 255,
    "b": 64
  },
  "hsl": {
    "h": 65.969,
    "s": 100,
    "l": 62.549
  },
  "oklch": {
    "l": 0.95493,
    "c": 0.19976,
    "h": 115.3
  },
  "luminance": 0.89723
}

Semantic roles & 50–950 ramp

primary

#ECFF40

secondary

#3222C1

accent

#00E617

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170C

muted

#86857F

Preview Lab

Preview with #ECFF40

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

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