#4257CB#4257CB

#4257CB is a mid, vivid blue. Relative luminance 0.123; OKLCH L 50.9% C 0.181 H 270.8°. Best body text is #FFFFFF at 6.07:1 contrast (WCAG AA passes).

Color values

HEX	#4257CB
RGB	rgb(66, 87, 203)
HSL	hsl(231, 57%, 53%)
HSV	hsv(231, 67%, 80%)
CMYK	cmyk(67.5%, 57.1%, 0%, 20.4%)
CIE-LAB	lab(41.67, 29.98, -62.70)
CIE-LCH	lch(41.67, 69.49, 295.55°)
OKLab	oklab(50.87% 0.0025 -0.1805)
OKLCH	oklch(50.87% 0.181 270.8)
XYZ	xyz(16.4308, 12.2849, 57.9937)
Luminance	0.1229 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4257CB #CBB642

analogous

#429BCB #4257CB #7242CB

triadic

#4257CB #CB4257 #57CB42

tetradic

#4257CB #CB429B #CBB642 #42CB72

square

#4257CB #CB429B #CBB642 #42CB72

split-complementary

#4257CB #CB7242 #9BCB42

monochromatic

#202C73 #2D3FA3 #4257CB #7282D8 #A2ACE5

Accessibility & contrast

On white

6.07

#4257CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.46

#4257CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4257CB

6.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4257CB	#FFFFFF	#000000	##FFFFFF
##4257CB	1.00	6.07	3.46	6.07
#FFFFFF	6.07	1.00	21.00	1.00
#000000	3.46	21.00	1.00	21.00
##FFFFFF	6.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0069CF

Deuteranopia (green-blind)

#005CC9

Tritanopia (blue-blind)

#007388

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #4257cb;
/* rgb */ color: rgb(66, 87, 203);
/* oklch */ color: oklch(50.9% 0.181 270.8);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#4257cb",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 203
  },
  "hsl": {
    "h": 230.803,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.50868,
    "c": 0.18056,
    "h": 270.8
  },
  "luminance": 0.12286
}

Semantic roles & 50–950 ramp

primary

#4257CB

secondary

#D2C997

accent

#C948E0

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #4257CB

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

Preview Lab → · Contrast checker → · Palette generator →