#1B3879#1B3879

#1B3879 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.9% C 0.117 H 263.5°. Best body text is #FFFFFF at 11.12:1 contrast (WCAG AA passes).

Color values

HEX	#1B3879
RGB	rgb(27, 56, 121)
HSL	hsl(221, 64%, 29%)
HSV	hsv(221, 78%, 47%)
CMYK	cmyk(77.7%, 53.7%, 0%, 52.5%)
CIE-LAB	lab(25.08, 14.15, -40.27)
CIE-LCH	lch(25.08, 42.68, 289.36°)
OKLab	oklab(35.91% -0.0131 -0.1159)
OKLCH	oklch(35.91% 0.117 263.5)
XYZ	xyz(5.3161, 4.4412, 18.6625)
Luminance	0.0444 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3879 #795C1B

analogous

#1B6779 #1B3879 #2D1B79

triadic

#1B3879 #791B38 #38791B

tetradic

#1B3879 #791B67 #795C1B #1B792D

square

#1B3879 #791B67 #795C1B #1B792D

split-complementary

#1B3879 #792D1B #67791B

monochromatic

#060C19 #102147 #1B3879 #264FAB #3B6AD3

Accessibility & contrast

On white

11.12

#1B3879 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B3879 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3879

11.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3879	#FFFFFF	#000000	##FFFFFF
##1B3879	1.00	11.12	1.89	11.12
#FFFFFF	11.12	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D407B

Deuteranopia (green-blind)

#003778

Tritanopia (blue-blind)

#004853

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b3879;
/* rgb */ color: rgb(27, 56, 121);
/* oklch */ color: oklch(35.9% 0.117 263.5);

Tailwind

colors: {
  custom: {
    50: '#666ea0',
    500: '#1b3879',
    950: '#000000',
  },
}

SCSS

$custom: #1b3879;
$custom-light: #666ea0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3879",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 121
  },
  "hsl": {
    "h": 221.489,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.35907,
    "c": 0.11661,
    "h": 263.5
  },
  "luminance": 0.04442
}

Semantic roles & 50–950 ramp

primary

#1B3879

secondary

#AD8C43

accent

#B441E7

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1B3879

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

Preview Lab → · Contrast checker → · Palette generator →