#ECFF99#ECFF99

#ECFF99 is a very light, vivid yellow-green. Relative luminance 0.917; OKLCH L 96.4% C 0.128 H 117.5°. Best body text is #000000 at 19.33:1 contrast (WCAG AA passes).

Color values

HEX	#ECFF99
RGB	rgb(236, 255, 153)
HSL	hsl(71, 100%, 80%)
HSV	hsv(71, 40%, 100%)
CMYK	cmyk(7.5%, 0%, 40%, 0%)
CIE-LAB	lab(96.68, -21.39, 46.62)
CIE-LCH	lch(96.68, 51.29, 114.65°)
OKLab	oklab(96.39% -0.0591 0.1135)
OKLCH	oklch(96.39% 0.128 117.5)
XYZ	xyz(76.1022, 91.6533, 43.8126)
Luminance	0.9165 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#ECFF99 #AC99FF

analogous

#FFDF99 #ECFF99 #B9FF99

triadic

#ECFF99 #99ECFF #FF99EC

tetradic

#ECFF99 #99FFDF #AC99FF #FF99B9

square

#ECFF99 #99FFDF #AC99FF #FF99B9

split-complementary

#ECFF99 #99B9FF #DF99FF

monochromatic

#D5FF1F #E1FF5C #ECFF99 #F7FFD6 #F9FFE0

Accessibility & contrast

On white

1.09

#ECFF99 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

19.33

#ECFF99 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #ECFF99

19.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##ECFF99	#FFFFFF	#000000	##000000
##ECFF99	1.00	1.09	19.33	19.33
#FFFFFF	1.09	1.00	21.00	21.00
#000000	19.33	21.00	1.00	1.00
##000000	19.33	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF591

Deuteranopia (green-blind)

#FFF69E

Tritanopia (blue-blind)

#F6F5E6

Achromatopsia (no color)

#F5F5F5

Design tokens & code

CSS

--color: #ecff99;
/* rgb */ color: rgb(236, 255, 153);
/* oklch */ color: oklch(96.4% 0.128 117.5);

Tailwind

colors: {
  custom: {
    50: '#f3ffb8',
    500: '#ecff99',
    950: '#000000',
  },
}

SCSS

$custom: #ecff99;
$custom-light: #f3ffb8;
$custom-dark: #000000;

JSON

{
  "hex": "#ecff99",
  "rgb": {
    "r": 236,
    "g": 255,
    "b": 153
  },
  "hsl": {
    "h": 71.176,
    "s": 100,
    "l": 80
  },
  "oklch": {
    "l": 0.96387,
    "c": 0.128,
    "h": 117.5
  },
  "luminance": 0.91653
}

Semantic roles & 50–950 ramp

primary

#ECFF99

secondary

#745AE2

accent

#00E62B

background

#FFFFFD

surface

#FEFFF8

border

#D6D7D1

text

#171811

muted

#858681

Preview Lab

Preview with #ECFF99

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

Preview Lab → · Contrast checker → · Palette generator →