#1B3379#1B3379

#1B3379 is a dark, vivid blue. Relative luminance 0.040; OKLCH L 34.8% C 0.123 H 265.8°. Best body text is #FFFFFF at 11.69:1 contrast (WCAG AA passes).

Color values

HEX	#1B3379
RGB	rgb(27, 51, 121)
HSL	hsl(225, 64%, 29%)
HSV	hsv(225, 78%, 47%)
CMYK	cmyk(77.7%, 57.9%, 0%, 52.5%)
CIE-LAB	lab(23.61, 17.69, -42.66)
CIE-LCH	lch(23.61, 46.18, 292.53°)
OKLab	oklab(34.79% -0.0089 -0.123)
OKLCH	oklch(34.79% 0.123 265.8)
XYZ	xyz(5.0858, 3.9806, 18.5857)
Luminance	0.0398 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3379 #79611B

analogous

#1B6279 #1B3379 #321B79

triadic

#1B3379 #791B33 #33791B

tetradic

#1B3379 #791B62 #79611B #1B7932

square

#1B3379 #791B62 #79611B #1B7932

split-complementary

#1B3379 #79321B #62791B

monochromatic

#060B19 #101E47 #1B3379 #2648AB #3B62D3

Accessibility & contrast

On white

11.69

#1B3379 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#1B3379 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3379

11.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3379	#FFFFFF	#000000	##FFFFFF
##1B3379	1.00	11.69	1.80	11.69
#FFFFFF	11.69	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D7B

Deuteranopia (green-blind)

#003478

Tritanopia (blue-blind)

#004450

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b3379;
/* rgb */ color: rgb(27, 51, 121);
/* oklch */ color: oklch(34.8% 0.123 265.8);

Tailwind

colors: {
  custom: {
    50: '#666aa0',
    500: '#1b3379',
    950: '#000000',
  },
}

SCSS

$custom: #1b3379;
$custom-light: #666aa0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3379",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 121
  },
  "hsl": {
    "h": 224.681,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.34792,
    "c": 0.1233,
    "h": 265.8
  },
  "luminance": 0.03981
}

Semantic roles & 50–950 ramp

primary

#1B3379

secondary

#AD9243

accent

#BC41E7

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07060F

muted

#7A7A7E

Preview Lab

Preview with #1B3379

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

Preview Lab → · Contrast checker → · Palette generator →