#4257C9#4257C9

#4257C9 is a mid, vivid blue. Relative luminance 0.122; OKLCH L 50.7% C 0.178 H 270.8°. Best body text is #FFFFFF at 6.11:1 contrast (WCAG AA passes).

Color values

HEX	#4257C9
RGB	rgb(66, 87, 201)
HSL	hsl(231, 56%, 52%)
HSV	hsv(231, 67%, 79%)
CMYK	cmyk(67.2%, 56.7%, 0%, 21.2%)
CIE-LAB	lab(41.52, 29.27, -61.78)
CIE-LCH	lch(41.52, 68.37, 295.35°)
OKLab	oklab(50.71% 0.0025 -0.1778)
OKLCH	oklch(50.71% 0.178 270.8)
XYZ	xyz(16.1940, 12.1902, 56.7465)
Luminance	0.1219 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4257C9 #C9B442

analogous

#429AC9 #4257C9 #7142C9

triadic

#4257C9 #C94257 #57C942

tetradic

#4257C9 #C9429A #C9B442 #42C971

square

#4257C9 #C9429A #C9B442 #42C971

split-complementary

#4257C9 #C97142 #9AC942

monochromatic

#202D70 #2E40A0 #4257C9 #7281D7 #A1ACE4

Accessibility & contrast

On white

6.11

#4257C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.44

#4257C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4257C9

6.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4257C9	#FFFFFF	#000000	##FFFFFF
##4257C9	1.00	6.11	3.44	6.11
#FFFFFF	6.11	1.00	21.00	1.00
#000000	3.44	21.00	1.00	21.00
##FFFFFF	6.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068CD

Deuteranopia (green-blind)

#005CC7

Tritanopia (blue-blind)

#007387

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #4257c9;
/* rgb */ color: rgb(66, 87, 201);
/* oklch */ color: oklch(50.7% 0.178 270.8);

Tailwind

colors: {
  custom: {
    50: '#8686da',
    500: '#4257c9',
    950: '#000000',
  },
}

SCSS

$custom: #4257c9;
$custom-light: #8686da;
$custom-dark: #000000;

JSON

{
  "hex": "#4257c9",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 201
  },
  "hsl": {
    "h": 230.667,
    "s": 55.556,
    "l": 52.353
  },
  "oklch": {
    "l": 0.5071,
    "c": 0.17787,
    "h": 270.8
  },
  "luminance": 0.12192
}

Semantic roles & 50–950 ramp

primary

#4257C9

secondary

#D1C896

accent

#C849DF

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #4257C9

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

Preview Lab → · Contrast checker → · Palette generator →