#4057CB#4057CB

#4057CB is a mid, vivid blue. Relative luminance 0.122; OKLCH L 50.8% C 0.181 H 270.2°. Best body text is #FFFFFF at 6.10:1 contrast (WCAG AA passes).

Color values

HEX	#4057CB
RGB	rgb(64, 87, 203)
HSL	hsl(230, 57%, 52%)
HSV	hsv(230, 68%, 80%)
CMYK	cmyk(68.5%, 57.1%, 0%, 20.4%)
CIE-LAB	lab(41.56, 29.69, -62.88)
CIE-LCH	lch(41.56, 69.53, 295.27°)
OKLab	oklab(50.76% 0.0005 -0.1811)
OKLCH	oklch(50.76% 0.181 270.2)
XYZ	xyz(16.2984, 12.2166, 57.9874)
Luminance	0.1222 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4057CB #CBB440

analogous

#409DCB #4057CB #6F40CB

triadic

#4057CB #CB4057 #57CB40

tetradic

#4057CB #CB409D #CBB440 #40CB6F

square

#4057CB #CB409D #CBB440 #40CB6F

split-complementary

#4057CB #CB6F40 #9DCB40

monochromatic

#1F2D72 #2C40A2 #4057CB #7081D8 #A0ACE5

Accessibility & contrast

On white

6.10

#4057CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.44

#4057CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4057CB

6.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4057CB	#FFFFFF	#000000	##FFFFFF
##4057CB	1.00	6.10	3.44	6.10
#FFFFFF	6.10	1.00	21.00	1.00
#000000	3.44	21.00	1.00	21.00
##FFFFFF	6.10	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: #4057cb;
/* rgb */ color: rgb(64, 87, 203);
/* oklch */ color: oklch(50.8% 0.181 270.2);

Tailwind

colors: {
  custom: {
    50: '#8586dc',
    500: '#4057cb',
    950: '#000000',
  },
}

SCSS

$custom: #4057cb;
$custom-light: #8586dc;
$custom-dark: #000000;

JSON

{
  "hex": "#4057cb",
  "rgb": {
    "r": 64,
    "g": 87,
    "b": 203
  },
  "hsl": {
    "h": 230.072,
    "s": 57.202,
    "l": 52.353
  },
  "oklch": {
    "l": 0.50759,
    "c": 0.18111,
    "h": 270.2
  },
  "luminance": 0.12218
}

Semantic roles & 50–950 ramp

primary

#4057CB

secondary

#D2C895

accent

#C747E0

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #4057CB

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

Preview Lab → · Contrast checker → · Palette generator →