#183B75#183B75

#183B75 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.2% C 0.108 H 260.0°. Best body text is #FFFFFF at 10.93:1 contrast (WCAG AA passes).

Color values

HEX	#183B75
RGB	rgb(24, 59, 117)
HSL	hsl(217, 66%, 28%)
HSV	hsv(217, 79%, 46%)
CMYK	cmyk(79.5%, 49.6%, 0%, 54.1%)
CIE-LAB	lab(25.58, 9.98, -36.93)
CIE-LCH	lch(25.58, 38.26, 285.12°)
OKLab	oklab(36.16% -0.0187 -0.106)
OKLCH	oklch(36.16% 0.108 260)
XYZ	xyz(5.1504, 4.6059, 17.4438)
Luminance	0.0461 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B75 #755218

analogous

#186A75 #183B75 #231875

triadic

#183B75 #75183B #3B7518

tetradic

#183B75 #75186A #755218 #187523

square

#183B75 #75186A #755218 #187523

split-complementary

#183B75 #752318 #6A7518

monochromatic

#050D19 #0E2142 #183B75 #2255A8 #3270D5

Accessibility & contrast

On white

10.93

#183B75 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#183B75 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B75

10.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B75	#FFFFFF	#000000	##FFFFFF
##183B75	1.00	10.93	1.92	10.93
#FFFFFF	10.93	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B4177

Deuteranopia (green-blind)

#013974

Tritanopia (blue-blind)

#004952

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183b75;
/* rgb */ color: rgb(24, 59, 117);
/* oklch */ color: oklch(36.2% 0.108 260.0);

Tailwind

colors: {
  custom: {
    50: '#64709d',
    500: '#183b75',
    950: '#000000',
  },
}

SCSS

$custom: #183b75;
$custom-light: #64709d;
$custom-dark: #000000;

JSON

{
  "hex": "#183b75",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 117
  },
  "hsl": {
    "h": 217.419,
    "s": 65.957,
    "l": 27.647
  },
  "oklch": {
    "l": 0.36164,
    "c": 0.10768,
    "h": 260
  },
  "luminance": 0.04606
}

Semantic roles & 50–950 ramp

primary

#183B75

secondary

#AA823F

accent

#A93FE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183B75

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

Preview Lab → · Contrast checker → · Palette generator →