#4289DF#4289DF

#4289DF is a light, vivid cyan. Relative luminance 0.244; OKLCH L 62.6% C 0.148 H 254.8°. Best body text is #000000 at 5.88:1 contrast (WCAG AA passes).

Color values

HEX	#4289DF
RGB	rgb(66, 137, 223)
HSL	hsl(213, 71%, 57%)
HSV	hsv(213, 70%, 87%)
CMYK	cmyk(70.4%, 38.6%, 0%, 12.5%)
CIE-LAB	lab(56.46, 5.91, -50.28)
CIE-LCH	lch(56.46, 50.63, 276.70°)
OKLab	oklab(62.59% -0.039 -0.1433)
OKLCH	oklch(62.59% 0.149 254.8)
XYZ	xyz(24.5068, 24.3746, 73.2109)
Luminance	0.2438 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4289DF #DF9842

analogous

#42D8DF #4289DF #4A42DF

triadic

#4289DF #DF4289 #89DF42

tetradic

#4289DF #DF42D8 #DF9842 #42DF4A

square

#4289DF #DF42D8 #DF9842 #42DF4A

split-complementary

#4289DF #DF4A42 #D8DF42

monochromatic

#184E8E #216AC3 #4289DF #76AAE8 #ABCAF1

Accessibility & contrast

On white

3.57

#4289DF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.88

#4289DF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4289DF

5.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4289DF	#FFFFFF	#000000	##000000
##4289DF	1.00	3.57	5.88	5.88
#FFFFFF	3.57	1.00	21.00	21.00
#000000	5.88	21.00	1.00	1.00
##000000	5.88	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#618FE2

Deuteranopia (green-blind)

#4981DD

Tritanopia (blue-blind)

#009DA9

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #4289df;
/* rgb */ color: rgb(66, 137, 223);
/* oklch */ color: oklch(62.6% 0.148 254.8);

Tailwind

colors: {
  custom: {
    50: '#88aae9',
    500: '#4289df',
    950: '#000000',
  },
}

SCSS

$custom: #4289df;
$custom-light: #88aae9;
$custom-dark: #000000;

JSON

{
  "hex": "#4289df",
  "rgb": {
    "r": 66,
    "g": 137,
    "b": 223
  },
  "hsl": {
    "h": 212.866,
    "s": 71.041,
    "l": 56.667
  },
  "oklch": {
    "l": 0.62586,
    "c": 0.1485,
    "h": 254.8
  },
  "luminance": 0.24377
}

Semantic roles & 50–950 ramp

primary

#4289DF

secondary

#DFC19E

accent

#9C3AEE

background

#F9FAFE

surface

#F1F4FD

border

#CBCED5

text

#0D1016

muted

#7E7F84

Preview Lab

Preview with #4289DF

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

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