#243CB1#243CB1

#243CB1 is a dark, vivid blue. Relative luminance 0.068; OKLCH L 42.1% C 0.187 H 267.9°. Best body text is #FFFFFF at 8.91:1 contrast (WCAG AA passes).

Color values

HEX	#243CB1
RGB	rgb(36, 60, 177)
HSL	hsl(230, 66%, 42%)
HSV	hsv(230, 80%, 69%)
CMYK	cmyk(79.7%, 66.1%, 0%, 30.6%)
CIE-LAB	lab(31.30, 34.32, -64.44)
CIE-LCH	lch(31.30, 73.01, 298.04°)
OKLab	oklab(42.13% -0.007 -0.1866)
OKLCH	oklch(42.13% 0.187 267.9)
XYZ	xyz(10.2765, 6.7799, 42.3535)
Luminance	0.0678 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243CB1 #B19924

analogous

#2483B1 #243CB1 #5324B1

triadic

#243CB1 #B1243C #3CB124

tetradic

#243CB1 #B12483 #B19924 #24B153

square

#243CB1 #B12483 #B19924 #24B153

split-complementary

#243CB1 #B15324 #83B124

monochromatic

#0F1A4B #1A2B7E #243CB1 #3B56D7 #6E82E1

Accessibility & contrast

On white

8.91

#243CB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#243CB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243CB1

8.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243CB1	#FFFFFF	#000000	##FFFFFF
##243CB1	1.00	8.91	2.36	8.91
#FFFFFF	8.91	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B5

Deuteranopia (green-blind)

#0043AF

Tritanopia (blue-blind)

#005B71

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #243cb1;
/* rgb */ color: rgb(36, 60, 177);
/* oklch */ color: oklch(42.1% 0.187 267.9);

Tailwind

colors: {
  custom: {
    50: '#7771c9',
    500: '#243cb1',
    950: '#000000',
  },
}

SCSS

$custom: #243cb1;
$custom-light: #7771c9;
$custom-dark: #000000;

JSON

{
  "hex": "#243cb1",
  "rgb": {
    "r": 36,
    "g": 60,
    "b": 177
  },
  "hsl": {
    "h": 229.787,
    "s": 66.197,
    "l": 41.765
  },
  "oklch": {
    "l": 0.42129,
    "c": 0.1867,
    "h": 267.9
  },
  "luminance": 0.06781
}

Semantic roles & 50–950 ramp

primary

#243CB1

secondary

#C8B869

accent

#CC3FE9

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #243CB1

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

Preview Lab → · Contrast checker → · Palette generator →