#1B2371#1B2371

#1B2371 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 30.8% C 0.133 H 271.4°. Best body text is #FFFFFF at 13.77:1 contrast (WCAG AA passes).

Color values

HEX	#1B2371
RGB	rgb(27, 35, 113)
HSL	hsl(234, 61%, 27%)
HSV	hsv(234, 76%, 44%)
CMYK	cmyk(76.1%, 69%, 0%, 55.7%)
CIE-LAB	lab(18.48, 25.76, -45.90)
CIE-LCH	lch(18.48, 52.63, 299.30°)
OKLab	oklab(30.77% 0.0032 -0.1327)
OKLCH	oklch(30.77% 0.133 271.4)
XYZ	xyz(4.0327, 2.6269, 15.9141)
Luminance	0.0263 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2371 #71691B

analogous

#1B4E71 #1B2371 #3E1B71

triadic

#1B2371 #711B23 #23711B

tetradic

#1B2371 #711B4E #71691B #1B713E

square

#1B2371 #711B4E #71691B #1B713E

split-complementary

#1B2371 #713E1B #4E711B

monochromatic

#060819 #0F1440 #1B2371 #2732A2 #3745CF

Accessibility & contrast

On white

13.77

#1B2371 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#1B2371 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2371

13.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2371	#FFFFFF	#000000	##FFFFFF
##1B2371	1.00	13.77	1.53	13.77
#FFFFFF	13.77	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003173

Deuteranopia (green-blind)

#002970

Tritanopia (blue-blind)

#003846

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b2371;
/* rgb */ color: rgb(27, 35, 113);
/* oklch */ color: oklch(30.8% 0.133 271.4);

Tailwind

colors: {
  custom: {
    50: '#665e9b',
    500: '#1b2371',
    950: '#000000',
  },
}

SCSS

$custom: #1b2371;
$custom-light: #665e9b;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2371",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 113
  },
  "hsl": {
    "h": 234.419,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.30768,
    "c": 0.13273,
    "h": 271.4
  },
  "luminance": 0.02627
}

Semantic roles & 50–950 ramp

primary

#1B2371

secondary

#A69C42

accent

#D643E5

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07040E

muted

#7A797E

Preview Lab

Preview with #1B2371

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

Preview Lab → · Contrast checker → · Palette generator →