#183F8D#183F8D

#183F8D is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.0% C 0.137 H 262.2°. Best body text is #FFFFFF at 9.84:1 contrast (WCAG AA passes).

Color values

HEX	#183F8D
RGB	rgb(24, 63, 141)
HSL	hsl(220, 71%, 32%)
HSV	hsv(220, 83%, 55%)
CMYK	cmyk(83%, 55.3%, 0%, 44.7%)
CIE-LAB	lab(28.57, 17.08, -47.11)
CIE-LCH	lch(28.57, 50.12, 289.93°)
OKLab	oklab(39.01% -0.0187 -0.1359)
OKLCH	oklch(39.01% 0.137 262.2)
XYZ	xyz(6.9602, 5.6715, 25.9220)
Luminance	0.0567 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F8D #8D6618

analogous

#187A8D #183F8D #2C188D

triadic

#183F8D #8D183F #3F8D18

tetradic

#183F8D #8D187A #8D6618 #188D2C

square

#183F8D #8D187A #8D6618 #188D2C

split-complementary

#183F8D #8D2C18 #7A8D18

monochromatic

#061024 #0F2859 #183F8D #2156C1 #4175DF

Accessibility & contrast

On white

9.84

#183F8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#183F8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F8D

9.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F8D	#FFFFFF	#000000	##FFFFFF
##183F8D	1.00	9.84	2.13	9.84
#FFFFFF	9.84	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004990

Deuteranopia (green-blind)

#003E8B

Tritanopia (blue-blind)

#00525F

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #183f8d;
/* rgb */ color: rgb(24, 63, 141);
/* oklch */ color: oklch(39.0% 0.137 262.2);

Tailwind

colors: {
  custom: {
    50: '#6a73af',
    500: '#183f8d',
    950: '#000000',
  },
}

SCSS

$custom: #183f8d;
$custom-light: #6a73af;
$custom-dark: #000000;

JSON

{
  "hex": "#183f8d",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 141
  },
  "hsl": {
    "h": 220,
    "s": 70.909,
    "l": 32.353
  },
  "oklch": {
    "l": 0.39013,
    "c": 0.1372,
    "h": 262.2
  },
  "luminance": 0.05672
}

Semantic roles & 50–950 ramp

primary

#183F8D

secondary

#BF9542

accent

#B23AEE

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #183F8D

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

Preview Lab → · Contrast checker → · Palette generator →