#243A8B#243A8B

#243A8B is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.137 H 267.8°. Best body text is #FFFFFF at 10.23:1 contrast (WCAG AA passes).

Color values

HEX	#243A8B
RGB	rgb(36, 58, 139)
HSL	hsl(227, 59%, 34%)
HSV	hsv(227, 74%, 55%)
CMYK	cmyk(74.1%, 58.3%, 0%, 45.5%)
CIE-LAB	lab(27.48, 21.18, -47.63)
CIE-LCH	lch(27.48, 52.13, 293.97°)
OKLab	oklab(38.27% -0.0053 -0.1373)
OKLCH	oklch(38.27% 0.137 267.8)
XYZ	xyz(6.8992, 5.2645, 25.0736)
Luminance	0.0527 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243A8B #8B7524

analogous

#246E8B #243A8B #41248B

triadic

#243A8B #8B243A #3A8B24

tetradic

#243A8B #8B246E #8B7524 #248B41

square

#243A8B #8B246E #8B7524 #248B41

split-complementary

#243A8B #8B4124 #6E8B24

monochromatic

#0B112A #17265A #243A8B #314EBC #5671D3

Accessibility & contrast

On white

10.23

#243A8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#243A8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243A8B

10.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243A8B	#FFFFFF	#000000	##FFFFFF
##243A8B	1.00	10.23	2.05	10.23
#FFFFFF	10.23	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468E

Deuteranopia (green-blind)

#003C89

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #243a8b;
/* rgb */ color: rgb(36, 58, 139);
/* oklch */ color: oklch(38.3% 0.137 267.8);

Tailwind

colors: {
  custom: {
    50: '#6e6fae',
    500: '#243a8b',
    950: '#000000',
  },
}

SCSS

$custom: #243a8b;
$custom-light: #6e6fae;
$custom-dark: #000000;

JSON

{
  "hex": "#243a8b",
  "rgb": {
    "r": 36,
    "g": 58,
    "b": 139
  },
  "hsl": {
    "h": 227.184,
    "s": 58.857,
    "l": 34.314
  },
  "oklch": {
    "l": 0.38274,
    "c": 0.1374,
    "h": 267.8
  },
  "luminance": 0.05265
}

Semantic roles & 50–950 ramp

primary

#243A8B

secondary

#B7A253

accent

#C146E2

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #243A8B

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

Preview Lab → · Contrast checker → · Palette generator →