#1B3571#1B3571

#1B3571 is a dark, moderate blue. Relative luminance 0.040; OKLCH L 34.6% C 0.109 H 264.0°. Best body text is #FFFFFF at 11.70:1 contrast (WCAG AA passes).

Color values

HEX	#1B3571
RGB	rgb(27, 53, 113)
HSL	hsl(222, 61%, 27%)
HSV	hsv(222, 76%, 44%)
CMYK	cmyk(76.1%, 53.1%, 0%, 55.7%)
CIE-LAB	lab(23.58, 13.00, -37.61)
CIE-LCH	lch(23.58, 39.79, 289.07°)
OKLab	oklab(34.57% -0.0114 -0.1081)
OKLCH	oklch(34.57% 0.109 264)
XYZ	xyz(4.7047, 3.9710, 16.1381)
Luminance	0.0397 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3571 #71571B

analogous

#1B6071 #1B3571 #2C1B71

triadic

#1B3571 #711B35 #35711B

tetradic

#1B3571 #711B60 #71571B #1B712C

square

#1B3571 #711B60 #71571B #1B712C

split-complementary

#1B3571 #712C1B #60711B

monochromatic

#060C19 #0F1E40 #1B3571 #274CA2 #3765CF

Accessibility & contrast

On white

11.70

#1B3571 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1B3571 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3571

11.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3571	#FFFFFF	#000000	##FFFFFF
##1B3571	1.00	11.70	1.79	11.70
#FFFFFF	11.70	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#103C73

Deuteranopia (green-blind)

#003470

Tritanopia (blue-blind)

#00434D

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b3571;
/* rgb */ color: rgb(27, 53, 113);
/* oklch */ color: oklch(34.6% 0.109 264.0);

Tailwind

colors: {
  custom: {
    50: '#646b9a',
    500: '#1b3571',
    950: '#000000',
  },
}

SCSS

$custom: #1b3571;
$custom-light: #646b9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3571",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 113
  },
  "hsl": {
    "h": 221.86,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.3457,
    "c": 0.1087,
    "h": 264
  },
  "luminance": 0.03971
}

Semantic roles & 50–950 ramp

primary

#1B3571

secondary

#A68842

accent

#B443E5

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B3571

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

Preview Lab → · Contrast checker → · Palette generator →