#243AB1#243AB1

#243AB1 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.8% C 0.189 H 268.2°. Best body text is #FFFFFF at 9.07:1 contrast (WCAG AA passes).

Color values

HEX	#243AB1
RGB	rgb(36, 58, 177)
HSL	hsl(231, 66%, 42%)
HSV	hsv(231, 80%, 69%)
CMYK	cmyk(79.7%, 67.2%, 0%, 30.6%)
CIE-LAB	lab(30.82, 35.60, -65.24)
CIE-LCH	lch(30.82, 74.32, 298.62°)
OKLab	oklab(41.78% -0.0059 -0.1889)
OKLCH	oklch(41.78% 0.189 268.2)
XYZ	xyz(10.1737, 6.5743, 42.3192)
Luminance	0.0658 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243AB1 #B19B24

analogous

#2481B1 #243AB1 #5424B1

triadic

#243AB1 #B1243A #3AB124

tetradic

#243AB1 #B12481 #B19B24 #24B154

square

#243AB1 #B12481 #B19B24 #24B154

split-complementary

#243AB1 #B15424 #81B124

monochromatic

#0F194B #1A297E #243AB1 #3B53D7 #6E80E1

Accessibility & contrast

On white

9.07

#243AB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#243AB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243AB1

9.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243AB1	#FFFFFF	#000000	##FFFFFF
##243AB1	1.00	9.07	2.32	9.07
#FFFFFF	9.07	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004FB5

Deuteranopia (green-blind)

#0042AF

Tritanopia (blue-blind)

#005A70

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #243ab1;
/* rgb */ color: rgb(36, 58, 177);
/* oklch */ color: oklch(41.8% 0.189 268.2);

Tailwind

colors: {
  custom: {
    50: '#7770c9',
    500: '#243ab1',
    950: '#000000',
  },
}

SCSS

$custom: #243ab1;
$custom-light: #7770c9;
$custom-dark: #000000;

JSON

{
  "hex": "#243ab1",
  "rgb": {
    "r": 36,
    "g": 58,
    "b": 177
  },
  "hsl": {
    "h": 230.638,
    "s": 66.197,
    "l": 41.765
  },
  "oklch": {
    "l": 0.41776,
    "c": 0.18899,
    "h": 268.2
  },
  "luminance": 0.06576
}

Semantic roles & 50–950 ramp

primary

#243AB1

secondary

#C8B969

accent

#CF3FE9

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #243AB1

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

Preview Lab → · Contrast checker → · Palette generator →