#1B3671#1B3671

#1B3671 is a dark, moderate blue. Relative luminance 0.041; OKLCH L 34.8% C 0.107 H 263.4°. Best body text is #FFFFFF at 11.58:1 contrast (WCAG AA passes).

Color values

HEX	#1B3671
RGB	rgb(27, 54, 113)
HSL	hsl(221, 61%, 27%)
HSV	hsv(221, 76%, 44%)
CMYK	cmyk(76.1%, 52.2%, 0%, 55.7%)
CIE-LAB	lab(23.88, 12.29, -37.12)
CIE-LCH	lch(23.88, 39.10, 288.32°)
OKLab	oklab(34.8% -0.0124 -0.1066)
OKLCH	oklch(34.8% 0.107 263.4)
XYZ	xyz(4.7507, 4.0631, 16.1535)
Luminance	0.0406 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3671 #71561B

analogous

#1B6171 #1B3671 #2B1B71

triadic

#1B3671 #711B36 #36711B

tetradic

#1B3671 #711B61 #71561B #1B712B

square

#1B3671 #711B61 #71561B #1B712B

split-complementary

#1B3671 #712B1B #61711B

monochromatic

#060C19 #0F1E40 #1B3671 #274EA2 #3767CF

Accessibility & contrast

On white

11.58

#1B3671 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1B3671 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3671

11.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3671	#FFFFFF	#000000	##FFFFFF
##1B3671	1.00	11.58	1.81	11.58
#FFFFFF	11.58	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#133D73

Deuteranopia (green-blind)

#003570

Tritanopia (blue-blind)

#00444E

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3671;
/* rgb */ color: rgb(27, 54, 113);
/* oklch */ color: oklch(34.8% 0.107 263.4);

Tailwind

colors: {
  custom: {
    50: '#646c9a',
    500: '#1b3671',
    950: '#000000',
  },
}

SCSS

$custom: #1b3671;
$custom-light: #646c9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3671",
  "rgb": {
    "r": 27,
    "g": 54,
    "b": 113
  },
  "hsl": {
    "h": 221.163,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.34802,
    "c": 0.10736,
    "h": 263.4
  },
  "luminance": 0.04064
}

Semantic roles & 50–950 ramp

primary

#1B3671

secondary

#A68642

accent

#B243E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B3671

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

Preview Lab → · Contrast checker → · Palette generator →