#243D9B#243D9B

#243D9B is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.3% C 0.156 H 267.4°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#243D9B
RGB	rgb(36, 61, 155)
HSL	hsl(227, 62%, 37%)
HSV	hsv(227, 77%, 61%)
CMYK	cmyk(76.8%, 60.6%, 0%, 39.2%)
CIE-LAB	lab(29.61, 25.33, -53.97)
CIE-LCH	lch(29.61, 59.62, 295.14°)
OKLab	oklab(40.28% -0.0071 -0.1559)
OKLCH	oklch(40.28% 0.156 267.4)
XYZ	xyz(8.3106, 6.0782, 31.7392)
Luminance	0.0608 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243D9B #9B8224

analogous

#24799B #243D9B #46249B

triadic

#243D9B #9B243D #3D9B24

tetradic

#243D9B #9B2479 #9B8224 #249B46

square

#243D9B #9B2479 #9B8224 #249B46

split-complementary

#243D9B #9B4624 #799B24

monochromatic

#0D1638 #182969 #243D9B #3051CD #5F79DA

Accessibility & contrast

On white

9.48

#243D9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#243D9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243D9B

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243D9B	#FFFFFF	#000000	##FFFFFF
##243D9B	1.00	9.48	2.22	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B9E

Deuteranopia (green-blind)

#004099

Tritanopia (blue-blind)

#005566

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #243d9b;
/* rgb */ color: rgb(36, 61, 155);
/* oklch */ color: oklch(40.3% 0.156 267.4);

Tailwind

colors: {
  custom: {
    50: '#7272b9',
    500: '#243d9b',
    950: '#000000',
  },
}

SCSS

$custom: #243d9b;
$custom-light: #7272b9;
$custom-dark: #000000;

JSON

{
  "hex": "#243d9b",
  "rgb": {
    "r": 36,
    "g": 61,
    "b": 155
  },
  "hsl": {
    "h": 227.395,
    "s": 62.304,
    "l": 37.451
  },
  "oklch": {
    "l": 0.4028,
    "c": 0.15605,
    "h": 267.4
  },
  "luminance": 0.06079
}

Semantic roles & 50–950 ramp

primary

#243D9B

secondary

#BFAA5C

accent

#C342E5

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #243D9B

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

Preview Lab → · Contrast checker → · Palette generator →