#ECFF51#ECFF51

#ECFF51 is a very light, vivid yellow. Relative luminance 0.899; OKLCH L 95.6% C 0.190 H 115.5°. Best body text is #000000 at 18.99:1 contrast (WCAG AA passes).

Color values

HEX	#ECFF51
RGB	rgb(236, 255, 81)
HSL	hsl(67, 100%, 66%)
HSV	hsv(67, 68%, 100%)
CMYK	cmyk(7.5%, 0%, 68.2%, 0%)
CIE-LAB	lab(95.98, -27.20, 76.85)
CIE-LCH	lch(95.98, 81.52, 109.49°)
OKLab	oklab(95.6% -0.0819 0.1718)
OKLCH	oklch(95.6% 0.19 115.5)
XYZ	xyz(71.8391, 89.9481, 21.3603)
Luminance	0.8995 (WCAG relative)
Temperature	warm
Family	yellow

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#ECFF51 #6451FF

analogous

#FFBB51 #ECFF51 #95FF51

triadic

#ECFF51 #51ECFF #FF51EC

tetradic

#ECFF51 #51FFBB #6451FF #FF5195

square

#ECFF51 #51FFBB #6451FF #FF5195

split-complementary

#ECFF51 #5195FF #BB51FF

monochromatic

#BED600 #E5FF14 #ECFF51 #F3FF8E #F9FFCB

Accessibility & contrast

On white

1.11

#ECFF51 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

18.99

#ECFF51 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #ECFF51

18.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##ECFF51	#FFFFFF	#000000	##000000
##ECFF51	1.00	1.11	18.99	18.99
#FFFFFF	1.11	1.00	21.00	21.00
#000000	18.99	21.00	1.00	1.00
##000000	18.99	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#FFF235

Deuteranopia (green-blind)

#FFF55E

Tritanopia (blue-blind)

#FBF1DD

Achromatopsia (no color)

#F3F3F3

Design tokens & code

CSS

--color: #ecff51;
/* rgb */ color: rgb(236, 255, 81);
/* oklch */ color: oklch(95.6% 0.190 115.5);

Tailwind

colors: {
  custom: {
    50: '#f6ff8c',
    500: '#ecff51',
    950: '#000000',
  },
}

SCSS

$custom: #ecff51;
$custom-light: #f6ff8c;
$custom-dark: #000000;

JSON

{
  "hex": "#ecff51",
  "rgb": {
    "r": 236,
    "g": 255,
    "b": 81
  },
  "hsl": {
    "h": 66.552,
    "s": 100,
    "l": 65.882
  },
  "oklch": {
    "l": 0.95597,
    "c": 0.19029,
    "h": 115.5
  },
  "luminance": 0.89947
}

Semantic roles & 50–950 ramp

primary

#ECFF51

secondary

#3725D0

accent

#00E619

background

#FFFFFC

surface

#FFFFF4

border

#D7D7CE

text

#18170D

muted

#86857F

Preview Lab

Preview with #ECFF51

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

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