#183B9F#183B9F

#183B9F is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.8% C 0.167 H 264.8°. Best body text is #FFFFFF at 9.70:1 contrast (WCAG AA passes).

Color values

HEX	#183B9F
RGB	rgb(24, 59, 159)
HSL	hsl(224, 74%, 36%)
HSV	hsv(224, 85%, 62%)
CMYK	cmyk(84.9%, 62.9%, 0%, 37.6%)
CIE-LAB	lab(28.96, 27.09, -57.47)
CIE-LCH	lch(28.96, 63.54, 295.23°)
OKLab	oklab(39.78% -0.0153 -0.1664)
OKLCH	oklch(39.78% 0.167 264.8)
XYZ	xyz(8.1964, 5.8243, 33.4864)
Luminance	0.0583 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B9F #9F7C18

analogous

#187E9F #183B9F #38189F

triadic

#183B9F #9F183B #3B9F18

tetradic

#183B9F #9F187E #9F7C18 #189F38

square

#183B9F #9F187E #9F7C18 #189F38

split-complementary

#183B9F #9F3818 #7E9F18

monochromatic

#081435 #10276A #183B9F #204FD4 #4D74E4

Accessibility & contrast

On white

9.70

#183B9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.17

#183B9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B9F

9.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B9F	#FFFFFF	#000000	##FFFFFF
##183B9F	1.00	9.70	2.17	9.70
#FFFFFF	9.70	1.00	21.00	1.00
#000000	2.17	21.00	1.00	21.00
##FFFFFF	9.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BA2

Deuteranopia (green-blind)

#003E9D

Tritanopia (blue-blind)

#005567

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #183b9f;
/* rgb */ color: rgb(24, 59, 159);
/* oklch */ color: oklch(39.8% 0.167 264.8);

Tailwind

colors: {
  custom: {
    50: '#6f70bc',
    500: '#183b9f',
    950: '#000000',
  },
}

SCSS

$custom: #183b9f;
$custom-light: #6f70bc;
$custom-dark: #000000;

JSON

{
  "hex": "#183b9f",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 159
  },
  "hsl": {
    "h": 224.444,
    "s": 73.77,
    "l": 35.882
  },
  "oklch": {
    "l": 0.3978,
    "c": 0.16709,
    "h": 264.8
  },
  "luminance": 0.05825
}

Semantic roles & 50–950 ramp

primary

#183B9F

secondary

#C6A74D

accent

#C037F0

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #183B9F

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

Preview Lab → · Contrast checker → · Palette generator →