#183F7F#183F7F

#183F7F is a dark, moderate blue. Relative luminance 0.053; OKLCH L 37.9% C 0.117 H 259.9°. Best body text is #FFFFFF at 10.21:1 contrast (WCAG AA passes).

Color values

HEX	#183F7F
RGB	rgb(24, 63, 127)
HSL	hsl(217, 68%, 30%)
HSV	hsv(217, 81%, 50%)
CMYK	cmyk(81.1%, 50.4%, 0%, 50.2%)
CIE-LAB	lab(27.52, 11.32, -40.11)
CIE-LCH	lch(27.52, 41.68, 285.76°)
OKLab	oklab(37.88% -0.0205 -0.1153)
OKLCH	oklch(37.88% 0.117 259.9)
XYZ	xyz(5.9836, 5.2808, 20.7785)
Luminance	0.0528 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F7F #7F5818

analogous

#18727F #183F7F #25187F

triadic

#183F7F #7F183F #3F7F18

tetradic

#183F7F #7F1872 #7F5818 #187F25

square

#183F7F #7F1872 #7F5818 #187F25

split-complementary

#183F7F #7F2518 #727F18

monochromatic

#050D1A #0E254C #183F7F #2259B2 #3875D9

Accessibility & contrast

On white

10.21

#183F7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#183F7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F7F

10.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F7F	#FFFFFF	#000000	##FFFFFF
##183F7F	1.00	10.21	2.06	10.21
#FFFFFF	10.21	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4681

Deuteranopia (green-blind)

#003D7E

Tritanopia (blue-blind)

#004E59

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183f7f;
/* rgb */ color: rgb(24, 63, 127);
/* oklch */ color: oklch(37.9% 0.117 259.9);

Tailwind

colors: {
  custom: {
    50: '#6673a5',
    500: '#183f7f',
    950: '#000000',
  },
}

SCSS

$custom: #183f7f;
$custom-light: #6673a5;
$custom-dark: #000000;

JSON

{
  "hex": "#183f7f",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 127
  },
  "hsl": {
    "h": 217.282,
    "s": 68.212,
    "l": 29.608
  },
  "oklch": {
    "l": 0.37881,
    "c": 0.11713,
    "h": 259.9
  },
  "luminance": 0.05282
}

Semantic roles & 50–950 ramp

primary

#183F7F

secondary

#B3873F

accent

#A93DEB

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #183F7F

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

Preview Lab → · Contrast checker → · Palette generator →