#1B3D79#1B3D79

#1B3D79 is a dark, moderate blue. Relative luminance 0.050; OKLCH L 37.1% C 0.110 H 260.8°. Best body text is #FFFFFF at 10.55:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D79
RGB	rgb(27, 61, 121)
HSL	hsl(218, 64%, 29%)
HSV	hsv(218, 78%, 47%)
CMYK	cmyk(77.7%, 49.6%, 0%, 52.5%)
CIE-LAB	lab(26.59, 10.63, -37.83)
CIE-LCH	lch(26.59, 39.29, 285.69°)
OKLab	oklab(37.06% -0.0176 -0.1086)
OKLCH	oklch(37.06% 0.11 260.8)
XYZ	xyz(5.5707, 4.9504, 18.7474)
Luminance	0.0495 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D79 #79571B

analogous

#1B6C79 #1B3D79 #281B79

triadic

#1B3D79 #791B3D #3D791B

tetradic

#1B3D79 #791B6C #79571B #1B7928

square

#1B3D79 #791B6C #79571B #1B7928

split-complementary

#1B3D79 #79281B #6C791B

monochromatic

#060D19 #102447 #1B3D79 #2656AB #3B72D3

Accessibility & contrast

On white

10.55

#1B3D79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#1B3D79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D79

10.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D79	#FFFFFF	#000000	##FFFFFF
##1B3D79	1.00	10.55	1.99	10.55
#FFFFFF	10.55	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C437B

Deuteranopia (green-blind)

#023B78

Tritanopia (blue-blind)

#004B55

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3d79;
/* rgb */ color: rgb(27, 61, 121);
/* oklch */ color: oklch(37.1% 0.110 260.8);

Tailwind

colors: {
  custom: {
    50: '#6672a0',
    500: '#1b3d79',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d79;
$custom-light: #6672a0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d79",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 121
  },
  "hsl": {
    "h": 218.298,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.37063,
    "c": 0.11001,
    "h": 260.8
  },
  "luminance": 0.04951
}

Semantic roles & 50–950 ramp

primary

#1B3D79

secondary

#AD8743

accent

#AB41E7

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1B3D79

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

Preview Lab → · Contrast checker → · Palette generator →