#1B3D84#1B3D84

#1B3D84 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.9% C 0.126 H 262.7°. Best body text is #FFFFFF at 10.26:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D84
RGB	rgb(27, 61, 132)
HSL	hsl(221, 66%, 31%)
HSV	hsv(221, 80%, 52%)
CMYK	cmyk(79.5%, 53.8%, 0%, 48.2%)
CIE-LAB	lab(27.40, 15.13, -43.43)
CIE-LCH	lch(27.40, 45.99, 289.21°)
OKLab	oklab(37.93% -0.016 -0.1251)
OKLCH	oklch(37.93% 0.126 262.7)
XYZ	xyz(6.2841, 5.2357, 22.5047)
Luminance	0.0524 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D84 #84621B

analogous

#1B7184 #1B3D84 #2D1B84

triadic

#1B3D84 #841B3D #3D841B

tetradic

#1B3D84 #841B71 #84621B #1B842D

square

#1B3D84 #841B71 #84621B #1B842D

split-complementary

#1B3D84 #842D1B #71841B

monochromatic

#060E1E #112651 #1B3D84 #2554B7 #4172D8

Accessibility & contrast

On white

10.26

#1B3D84 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#1B3D84 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D84

10.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D84	#FFFFFF	#000000	##FFFFFF
##1B3D84	1.00	10.26	2.05	10.26
#FFFFFF	10.26	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C4687

Deuteranopia (green-blind)

#003C83

Tritanopia (blue-blind)

#004E5A

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b3d84;
/* rgb */ color: rgb(27, 61, 132);
/* oklch */ color: oklch(37.9% 0.126 262.7);

Tailwind

colors: {
  custom: {
    50: '#6971a8',
    500: '#1b3d84',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d84;
$custom-light: #6971a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d84",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 132
  },
  "hsl": {
    "h": 220.571,
    "s": 66.038,
    "l": 31.176
  },
  "oklch": {
    "l": 0.37933,
    "c": 0.12609,
    "h": 262.7
  },
  "luminance": 0.05236
}

Semantic roles & 50–950 ramp

primary

#1B3D84

secondary

#B79243

accent

#B23FE9

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3D84

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

Preview Lab → · Contrast checker → · Palette generator →