#1B3D83#1B3D83

#1B3D83 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.9% C 0.125 H 262.6°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D83
RGB	rgb(27, 61, 131)
HSL	hsl(220, 66%, 31%)
HSV	hsv(220, 79%, 51%)
CMYK	cmyk(79.4%, 53.4%, 0%, 48.6%)
CIE-LAB	lab(27.32, 14.72, -42.93)
CIE-LCH	lch(27.32, 45.38, 288.93°)
OKLab	oklab(37.85% -0.0161 -0.1236)
OKLCH	oklch(37.85% 0.125 262.6)
XYZ	xyz(6.2160, 5.2085, 22.1461)
Luminance	0.0521 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D83 #83611B

analogous

#1B7183 #1B3D83 #2D1B83

triadic

#1B3D83 #831B3D #3D831B

tetradic

#1B3D83 #831B71 #83611B #1B832D

square

#1B3D83 #831B71 #83611B #1B832D

split-complementary

#1B3D83 #832D1B #71831B

monochromatic

#060E1E #112550 #1B3D83 #2555B6 #4172D8

Accessibility & contrast

On white

10.29

#1B3D83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1B3D83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D83

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D83	#FFFFFF	#000000	##FFFFFF
##1B3D83	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E4686

Deuteranopia (green-blind)

#003C82

Tritanopia (blue-blind)

#004E5A

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b3d83;
/* rgb */ color: rgb(27, 61, 131);
/* oklch */ color: oklch(37.9% 0.125 262.6);

Tailwind

colors: {
  custom: {
    50: '#6871a8',
    500: '#1b3d83',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d83;
$custom-light: #6871a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d83",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 131
  },
  "hsl": {
    "h": 220.385,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.37852,
    "c": 0.12464,
    "h": 262.6
  },
  "luminance": 0.05209
}

Semantic roles & 50–950 ramp

primary

#1B3D83

secondary

#B69143

accent

#B13FE9

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B3D83

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

Preview Lab → · Contrast checker → · Palette generator →