#183F9F#183F9F

#183F9F is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.6% C 0.162 H 263.8°. Best body text is #FFFFFF at 9.33:1 contrast (WCAG AA passes).

Color values

HEX	#183F9F
RGB	rgb(24, 63, 159)
HSL	hsl(223, 74%, 36%)
HSV	hsv(223, 85%, 62%)
CMYK	cmyk(84.9%, 60.4%, 0%, 37.6%)
CIE-LAB	lab(30.04, 24.36, -55.72)
CIE-LCH	lch(30.04, 60.81, 293.62°)
OKLab	oklab(40.58% -0.0175 -0.1612)
OKLCH	oklch(40.58% 0.162 263.8)
XYZ	xyz(8.4100, 6.2514, 33.5576)
Luminance	0.0625 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F9F #9F7818

analogous

#18829F #183F9F #35189F

triadic

#183F9F #9F183F #3F9F18

tetradic

#183F9F #9F1882 #9F7818 #189F35

square

#183F9F #9F1882 #9F7818 #189F35

split-complementary

#183F9F #9F3518 #829F18

monochromatic

#081535 #102A6A #183F9F #2054D4 #4D79E4

Accessibility & contrast

On white

9.33

#183F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.25

#183F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F9F

9.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F9F	#FFFFFF	#000000	##FFFFFF
##183F9F	1.00	9.33	2.25	9.33
#FFFFFF	9.33	1.00	21.00	1.00
#000000	2.25	21.00	1.00	21.00
##FFFFFF	9.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA2

Deuteranopia (green-blind)

#00419D

Tritanopia (blue-blind)

#005868

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #183f9f;
/* rgb */ color: rgb(24, 63, 159);
/* oklch */ color: oklch(40.6% 0.162 263.8);

Tailwind

colors: {
  custom: {
    50: '#6f73bc',
    500: '#183f9f',
    950: '#000000',
  },
}

SCSS

$custom: #183f9f;
$custom-light: #6f73bc;
$custom-dark: #000000;

JSON

{
  "hex": "#183f9f",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 159
  },
  "hsl": {
    "h": 222.667,
    "s": 73.77,
    "l": 35.882
  },
  "oklch": {
    "l": 0.4058,
    "c": 0.16214,
    "h": 263.8
  },
  "luminance": 0.06252
}

Semantic roles & 50–950 ramp

primary

#183F9F

secondary

#C6A34D

accent

#BB37F0

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #183F9F

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

Preview Lab → · Contrast checker → · Palette generator →