#1B4183#1B4183

#1B4183 is a dark, moderate blue. Relative luminance 0.057; OKLCH L 38.8% C 0.119 H 260.6°. Best body text is #FFFFFF at 9.86:1 contrast (WCAG AA passes).

Color values

HEX	#1B4183
RGB	rgb(27, 65, 131)
HSL	hsl(218, 66%, 31%)
HSV	hsv(218, 79%, 51%)
CMYK	cmyk(79.4%, 50.4%, 0%, 48.6%)
CIE-LAB	lab(28.52, 11.93, -41.00)
CIE-LCH	lch(28.52, 42.70, 286.23°)
OKLab	oklab(38.77% -0.0195 -0.1178)
OKLCH	oklch(38.77% 0.119 260.6)
XYZ	xyz(6.4375, 5.6516, 22.2199)
Luminance	0.0565 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4183 #835D1B

analogous

#1B7583 #1B4183 #291B83

triadic

#1B4183 #831B41 #41831B

tetradic

#1B4183 #831B75 #835D1B #1B8329

square

#1B4183 #831B75 #835D1B #1B8329

split-complementary

#1B4183 #83291B #75831B

monochromatic

#060F1E #112850 #1B4183 #255AB6 #4178D8

Accessibility & contrast

On white

9.86

#1B4183 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#1B4183 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4183

9.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4183	#FFFFFF	#000000	##FFFFFF
##1B4183	1.00	9.86	2.13	9.86
#FFFFFF	9.86	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B4885

Deuteranopia (green-blind)

#003F82

Tritanopia (blue-blind)

#00515B

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b4183;
/* rgb */ color: rgb(27, 65, 131);
/* oklch */ color: oklch(38.8% 0.119 260.6);

Tailwind

colors: {
  custom: {
    50: '#6875a7',
    500: '#1b4183',
    950: '#000000',
  },
}

SCSS

$custom: #1b4183;
$custom-light: #6875a7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4183",
  "rgb": {
    "r": 27,
    "g": 65,
    "b": 131
  },
  "hsl": {
    "h": 218.077,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.38765,
    "c": 0.11943,
    "h": 260.6
  },
  "luminance": 0.05652
}

Semantic roles & 50–950 ramp

primary

#1B4183

secondary

#B68C43

accent

#AB3FE9

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B4183

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

Preview Lab → · Contrast checker → · Palette generator →