#4257BC#4257BC

#4257BC is a mid, vivid blue. Relative luminance 0.116; OKLCH L 49.7% C 0.160 H 270.7°. Best body text is #FFFFFF at 6.32:1 contrast (WCAG AA passes).

Color values

HEX	#4257BC
RGB	rgb(66, 87, 188)
HSL	hsl(230, 48%, 50%)
HSV	hsv(230, 65%, 74%)
CMYK	cmyk(64.9%, 53.7%, 0%, 26.3%)
CIE-LAB	lab(40.58, 24.68, -55.74)
CIE-LCH	lch(40.58, 60.97, 293.88°)
OKLab	oklab(49.71% 0.0019 -0.1601)
OKLCH	oklch(49.71% 0.16 270.7)
XYZ	xyz(14.7290, 11.6042, 49.0308)
Luminance	0.1161 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4257BC #BCA742

analogous

#4294BC #4257BC #6A42BC

triadic

#4257BC #BC4257 #57BC42

tetradic

#4257BC #BC4294 #BCA742 #42BC6A

square

#4257BC #BC4294 #BCA742 #42BC6A

split-complementary

#4257BC #BC6A42 #94BC42

monochromatic

#222D61 #32428F #4257BC #6F7FCC #9CA7DC

Accessibility & contrast

On white

6.32

#4257BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.32

#4257BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4257BC

6.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4257BC	#FFFFFF	#000000	##FFFFFF
##4257BC	1.00	6.32	3.32	6.32
#FFFFFF	6.32	1.00	21.00	1.00
#000000	3.32	21.00	1.00	21.00
##FFFFFF	6.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1165C0

Deuteranopia (green-blind)

#005ABA

Tritanopia (blue-blind)

#006F81

Achromatopsia (no color)

#606060

Design tokens & code

CSS

--color: #4257bc;
/* rgb */ color: rgb(66, 87, 188);
/* oklch */ color: oklch(49.7% 0.160 270.7);

Tailwind

colors: {
  custom: {
    50: '#8386d1',
    500: '#4257bc',
    950: '#000000',
  },
}

SCSS

$custom: #4257bc;
$custom-light: #8386d1;
$custom-dark: #000000;

JSON

{
  "hex": "#4257bc",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 188
  },
  "hsl": {
    "h": 229.672,
    "s": 48.031,
    "l": 49.804
  },
  "oklch": {
    "l": 0.49711,
    "c": 0.1601,
    "h": 270.7
  },
  "luminance": 0.11605
}

Semantic roles & 50–950 ramp

primary

#4257BC

secondary

#C9BF91

accent

#C050D8

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0B14

muted

#7D7C82

Preview Lab

Preview with #4257BC

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

Preview Lab → · Contrast checker → · Palette generator →