#243DB1#243DB1

#243DB1 is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.3% C 0.186 H 267.7°. Best body text is #FFFFFF at 8.83:1 contrast (WCAG AA passes).

Color values

HEX	#243DB1
RGB	rgb(36, 61, 177)
HSL	hsl(229, 66%, 42%)
HSV	hsv(229, 80%, 69%)
CMYK	cmyk(79.7%, 65.5%, 0%, 30.6%)
CIE-LAB	lab(31.55, 33.67, -64.04)
CIE-LCH	lch(31.55, 72.35, 297.73°)
OKLab	oklab(42.31% -0.0075 -0.1854)
OKLCH	oklch(42.31% 0.186 267.7)
XYZ	xyz(10.3293, 6.8857, 42.3711)
Luminance	0.0689 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243DB1 #B19824

analogous

#2484B1 #243DB1 #5224B1

triadic

#243DB1 #B1243D #3DB124

tetradic

#243DB1 #B12484 #B19824 #24B152

square

#243DB1 #B12484 #B19824 #24B152

split-complementary

#243DB1 #B15224 #84B124

monochromatic

#0F1A4B #1A2B7E #243DB1 #3B57D7 #6E82E1

Accessibility & contrast

On white

8.83

#243DB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#243DB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243DB1

8.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243DB1	#FFFFFF	#000000	##FFFFFF
##243DB1	1.00	8.83	2.38	8.83
#FFFFFF	8.83	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051B5

Deuteranopia (green-blind)

#0044AF

Tritanopia (blue-blind)

#005C71

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #243db1;
/* rgb */ color: rgb(36, 61, 177);
/* oklch */ color: oklch(42.3% 0.186 267.7);

Tailwind

colors: {
  custom: {
    50: '#7772c9',
    500: '#243db1',
    950: '#000000',
  },
}

SCSS

$custom: #243db1;
$custom-light: #7772c9;
$custom-dark: #000000;

JSON

{
  "hex": "#243db1",
  "rgb": {
    "r": 36,
    "g": 61,
    "b": 177
  },
  "hsl": {
    "h": 229.362,
    "s": 66.197,
    "l": 41.765
  },
  "oklch": {
    "l": 0.42309,
    "c": 0.18554,
    "h": 267.7
  },
  "luminance": 0.06887
}

Semantic roles & 50–950 ramp

primary

#243DB1

secondary

#C8B769

accent

#CB3FE9

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #243DB1

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

Preview Lab → · Contrast checker → · Palette generator →