#1B4583#1B4583

#1B4583 is a dark, moderate blue. Relative luminance 0.061; OKLCH L 39.7% C 0.114 H 258.4°. Best body text is #FFFFFF at 9.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B4583
RGB	rgb(27, 69, 131)
HSL	hsl(216, 66%, 31%)
HSV	hsv(216, 79%, 51%)
CMYK	cmyk(79.4%, 47.3%, 0%, 48.6%)
CIE-LAB	lab(29.73, 9.18, -39.04)
CIE-LCH	lch(29.73, 40.11, 283.23°)
OKLab	oklab(39.7% -0.023 -0.112)
OKLCH	oklch(39.7% 0.114 258.4)
XYZ	xyz(6.6754, 6.1272, 22.2992)
Luminance	0.0613 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4583 #83591B

analogous

#1B7983 #1B4583 #251B83

triadic

#1B4583 #831B45 #45831B

tetradic

#1B4583 #831B79 #83591B #1B8325

square

#1B4583 #831B79 #83591B #1B8325

split-complementary

#1B4583 #83251B #79831B

monochromatic

#06101E #112A50 #1B4583 #2560B6 #417ED8

Accessibility & contrast

On white

9.44

#1B4583 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1B4583 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4583

9.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4583	#FFFFFF	#000000	##FFFFFF
##1B4583	1.00	9.44	2.23	9.44
#FFFFFF	9.44	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#244B85

Deuteranopia (green-blind)

#0B4282

Tritanopia (blue-blind)

#00545D

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b4583;
/* rgb */ color: rgb(27, 69, 131);
/* oklch */ color: oklch(39.7% 0.114 258.4);

Tailwind

colors: {
  custom: {
    50: '#6878a7',
    500: '#1b4583',
    950: '#000000',
  },
}

SCSS

$custom: #1b4583;
$custom-light: #6878a7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4583",
  "rgb": {
    "r": 27,
    "g": 69,
    "b": 131
  },
  "hsl": {
    "h": 215.769,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.39699,
    "c": 0.11434,
    "h": 258.4
  },
  "luminance": 0.06128
}

Semantic roles & 50–950 ramp

primary

#1B4583

secondary

#B68843

accent

#A43FE9

background

#F6F7FA

surface

#EBEDF4

border

#C6C8CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B4583

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

Preview Lab → · Contrast checker → · Palette generator →