#243D8B#243D8B

#243D8B is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.9% C 0.133 H 266.7°. Best body text is #FFFFFF at 9.93:1 contrast (WCAG AA passes).

Color values

HEX	#243D8B
RGB	rgb(36, 61, 139)
HSL	hsl(225, 59%, 34%)
HSV	hsv(225, 74%, 55%)
CMYK	cmyk(74.1%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(28.32, 19.11, -46.27)
CIE-LCH	lch(28.32, 50.06, 292.44°)
OKLab	oklab(38.91% -0.0078 -0.1332)
OKLCH	oklch(38.91% 0.133 266.7)
XYZ	xyz(7.0549, 5.5759, 25.1255)
Luminance	0.0558 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243D8B #8B7224

analogous

#24718B #243D8B #3F248B

triadic

#243D8B #8B243D #3D8B24

tetradic

#243D8B #8B2471 #8B7224 #248B3F

square

#243D8B #8B2471 #8B7224 #248B3F

split-complementary

#243D8B #8B3F24 #718B24

monochromatic

#0B122A #17285A #243D8B #3152BC #5675D3

Accessibility & contrast

On white

9.93

#243D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#243D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243D8B

9.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243D8B	#FFFFFF	#000000	##FFFFFF
##243D8B	1.00	9.93	2.12	9.93
#FFFFFF	9.93	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00488E

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #243d8b;
/* rgb */ color: rgb(36, 61, 139);
/* oklch */ color: oklch(38.9% 0.133 266.7);

Tailwind

colors: {
  custom: {
    50: '#6e72ad',
    500: '#243d8b',
    950: '#000000',
  },
}

SCSS

$custom: #243d8b;
$custom-light: #6e72ad;
$custom-dark: #000000;

JSON

{
  "hex": "#243d8b",
  "rgb": {
    "r": 36,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 225.437,
    "s": 58.857,
    "l": 34.314
  },
  "oklch": {
    "l": 0.38906,
    "c": 0.13347,
    "h": 266.7
  },
  "luminance": 0.05577
}

Semantic roles & 50–950 ramp

primary

#243D8B

secondary

#B79F53

accent

#BC46E2

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #243D8B

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

Preview Lab → · Contrast checker → · Palette generator →