#183F7B#183F7B

#183F7B is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.6% C 0.111 H 259.0°. Best body text is #FFFFFF at 10.32:1 contrast (WCAG AA passes).

Color values

HEX	#183F7B
RGB	rgb(24, 63, 123)
HSL	hsl(216, 67%, 29%)
HSV	hsv(216, 80%, 48%)
CMYK	cmyk(80.5%, 48.8%, 0%, 51.8%)
CIE-LAB	lab(27.24, 9.66, -38.06)
CIE-LCH	lch(27.24, 39.26, 284.25°)
OKLab	oklab(37.57% -0.0212 -0.1093)
OKLCH	oklch(37.57% 0.111 259)
XYZ	xyz(5.7280, 5.1786, 19.4327)
Luminance	0.0518 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F7B #7B5418

analogous

#18717B #183F7B #23187B

triadic

#183F7B #7B183F #3F7B18

tetradic

#183F7B #7B1871 #7B5418 #187B23

square

#183F7B #7B1871 #7B5418 #187B23

split-complementary

#183F7B #7B2318 #717B18

monochromatic

#050D1A #0E2548 #183F7B #2259AE #3676D8

Accessibility & contrast

On white

10.32

#183F7B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#183F7B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F7B

10.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F7B	#FFFFFF	#000000	##FFFFFF
##183F7B	1.00	10.32	2.04	10.32
#FFFFFF	10.32	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E457D

Deuteranopia (green-blind)

#033C7A

Tritanopia (blue-blind)

#004D57

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183f7b;
/* rgb */ color: rgb(24, 63, 123);
/* oklch */ color: oklch(37.6% 0.111 259.0);

Tailwind

colors: {
  custom: {
    50: '#6573a2',
    500: '#183f7b',
    950: '#000000',
  },
}

SCSS

$custom: #183f7b;
$custom-light: #6573a2;
$custom-dark: #000000;

JSON

{
  "hex": "#183f7b",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 123
  },
  "hsl": {
    "h": 216.364,
    "s": 67.347,
    "l": 28.824
  },
  "oklch": {
    "l": 0.37573,
    "c": 0.1113,
    "h": 259
  },
  "luminance": 0.05179
}

Semantic roles & 50–950 ramp

primary

#183F7B

secondary

#B0833F

accent

#A63EEA

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#06080F

muted

#7A7B7F

Preview Lab

Preview with #183F7B

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

Preview Lab → · Contrast checker → · Palette generator →