#4257CC#4257CC

#4257CC is a mid, vivid blue. Relative luminance 0.123; OKLCH L 50.9% C 0.182 H 270.8°. Best body text is #FFFFFF at 6.06:1 contrast (WCAG AA passes).

Color values

HEX	#4257CC
RGB	rgb(66, 87, 204)
HSL	hsl(231, 58%, 53%)
HSV	hsv(231, 68%, 80%)
CMYK	cmyk(67.6%, 57.4%, 0%, 20%)
CIE-LAB	lab(41.74, 30.33, -63.15)
CIE-LCH	lch(41.74, 70.06, 295.65°)
OKLab	oklab(50.95% 0.0026 -0.1819)
OKLCH	oklch(50.95% 0.182 270.8)
XYZ	xyz(16.5504, 12.3327, 58.6233)
Luminance	0.1233 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4257CC #CCB742

analogous

#429CCC #4257CC #7242CC

triadic

#4257CC #CC4257 #57CC42

tetradic

#4257CC #CC429C #CCB742 #42CC72

square

#4257CC #CC429C #CCB742 #42CC72

split-complementary

#4257CC #CC7242 #9CCC42

monochromatic

#1F2C74 #2C3FA4 #4257CC #7282D9 #A2ADE6

Accessibility & contrast

On white

6.06

#4257CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.47

#4257CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4257CC

6.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4257CC	#FFFFFF	#000000	##FFFFFF
##4257CC	1.00	6.06	3.47	6.06
#FFFFFF	6.06	1.00	21.00	1.00
#000000	3.47	21.00	1.00	21.00
##FFFFFF	6.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0069D0

Deuteranopia (green-blind)

#005CCA

Tritanopia (blue-blind)

#007489

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #4257cc;
/* rgb */ color: rgb(66, 87, 204);
/* oklch */ color: oklch(50.9% 0.182 270.8);

Tailwind

colors: {
  custom: {
    50: '#8686dc',
    500: '#4257cc',
    950: '#000000',
  },
}

SCSS

$custom: #4257cc;
$custom-light: #8686dc;
$custom-dark: #000000;

JSON

{
  "hex": "#4257cc",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 204
  },
  "hsl": {
    "h": 230.87,
    "s": 57.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.50947,
    "c": 0.1819,
    "h": 270.8
  },
  "luminance": 0.12334
}

Semantic roles & 50–950 ramp

primary

#4257CC

secondary

#D3CA97

accent

#C947E1

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0D0B15

muted

#7D7C83

Preview Lab

Preview with #4257CC

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

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