#4237BB#4237BB

#4237BB is a dark, vivid blue. Relative luminance 0.075; OKLCH L 44.0% C 0.198 H 278.2°. Best body text is #FFFFFF at 8.41:1 contrast (WCAG AA passes).

Color values

HEX	#4237BB
RGB	rgb(66, 55, 187)
HSL	hsl(245, 55%, 47%)
HSV	hsv(245, 71%, 73%)
CMYK	cmyk(64.7%, 70.6%, 0%, 26.7%)
CIE-LAB	lab(32.87, 44.16, -67.73)
CIE-LCH	lch(32.87, 80.85, 303.11°)
OKLab	oklab(44.02% 0.0283 -0.1955)
OKLCH	oklch(44.02% 0.198 278.2)
XYZ	xyz(12.5797, 7.4775, 47.7844)
Luminance	0.0748 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4237BB #B0BB37

analogous

#376EBB #4237BB #8437BB

triadic

#4237BB #BB4237 #37BB42

tetradic

#4237BB #BB376E #B0BB37 #37BB84

square

#4237BB #BB376E #B0BB37 #37BB84

split-complementary

#4237BB #BB8437 #6EBB37

monochromatic

#211B5C #31298C #4237BB #695FD0 #958EDE

Accessibility & contrast

On white

8.41

#4237BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.50

#4237BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4237BB

8.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4237BB	#FFFFFF	#000000	##FFFFFF
##4237BB	1.00	8.41	2.50	8.41
#FFFFFF	8.41	1.00	21.00	1.00
#000000	2.50	21.00	1.00	21.00
##FFFFFF	8.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053BF

Deuteranopia (green-blind)

#0048B9

Tritanopia (blue-blind)

#005B75

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #4237bb;
/* rgb */ color: rgb(66, 55, 187);
/* oklch */ color: oklch(44.0% 0.198 278.2);

Tailwind

colors: {
  custom: {
    50: '#856fd1',
    500: '#4237bb',
    950: '#000000',
  },
}

SCSS

$custom: #4237bb;
$custom-light: #856fd1;
$custom-dark: #000000;

JSON

{
  "hex": "#4237bb",
  "rgb": {
    "r": 66,
    "g": 55,
    "b": 187
  },
  "hsl": {
    "h": 245,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.44016,
    "c": 0.19751,
    "h": 278.2
  },
  "luminance": 0.07478
}

Semantic roles & 50–950 ramp

primary

#4237BB

secondary

#C3C985

accent

#DE4AD2

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0714

muted

#7D7A83

Preview Lab

Preview with #4237BB

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

Preview Lab → · Contrast checker → · Palette generator →