#4257CD#4257CD

#4257CD is a mid, vivid blue. Relative luminance 0.124; OKLCH L 51.0% C 0.183 H 270.8°. Best body text is #FFFFFF at 6.04:1 contrast (WCAG AA passes).

Color values

HEX	#4257CD
RGB	rgb(66, 87, 205)
HSL	hsl(231, 58%, 53%)
HSV	hsv(231, 68%, 80%)
CMYK	cmyk(67.8%, 57.6%, 0%, 19.6%)
CIE-LAB	lab(41.81, 30.68, -63.61)
CIE-LCH	lch(41.81, 70.62, 295.75°)
OKLab	oklab(51.03% 0.0026 -0.1832)
OKLCH	oklch(51.03% 0.183 270.8)
XYZ	xyz(16.6707, 12.3808, 59.2570)
Luminance	0.1238 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4257CD #CDB842

analogous

#429DCD #4257CD #7242CD

triadic

#4257CD #CD4257 #57CD42

tetradic

#4257CD #CD429D #CDB842 #42CD72

square

#4257CD #CD429D #CDB842 #42CD72

split-complementary

#4257CD #CD7242 #9DCD42

monochromatic

#1F2C76 #2C3EA6 #4257CD #7282DA #A3ADE7

Accessibility & contrast

On white

6.04

#4257CD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.48

#4257CD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4257CD

6.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4257CD	#FFFFFF	#000000	##FFFFFF
##4257CD	1.00	6.04	3.48	6.04
#FFFFFF	6.04	1.00	21.00	1.00
#000000	3.48	21.00	1.00	21.00
##FFFFFF	6.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0069D1

Deuteranopia (green-blind)

#005DCB

Tritanopia (blue-blind)

#007489

Achromatopsia (no color)

#636363

Design tokens & code

CSS

--color: #4257cd;
/* rgb */ color: rgb(66, 87, 205);
/* oklch */ color: oklch(51.0% 0.183 270.8);

Tailwind

colors: {
  custom: {
    50: '#8786dd',
    500: '#4257cd',
    950: '#000000',
  },
}

SCSS

$custom: #4257cd;
$custom-light: #8786dd;
$custom-dark: #000000;

JSON

{
  "hex": "#4257cd",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 205
  },
  "hsl": {
    "h": 230.935,
    "s": 58.159,
    "l": 53.137
  },
  "oklch": {
    "l": 0.51026,
    "c": 0.18324,
    "h": 270.8
  },
  "luminance": 0.12382
}

Semantic roles & 50–950 ramp

primary

#4257CD

secondary

#D3CA97

accent

#CA46E1

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0D0B15

muted

#7D7C83

Preview Lab

Preview with #4257CD

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

Preview Lab → · Contrast checker → · Palette generator →