#1B3479#1B3479

#1B3479 is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.0% C 0.122 H 265.4°. Best body text is #FFFFFF at 11.58:1 contrast (WCAG AA passes).

Color values

HEX	#1B3479
RGB	rgb(27, 52, 121)
HSL	hsl(224, 64%, 29%)
HSV	hsv(224, 78%, 47%)
CMYK	cmyk(77.7%, 57%, 0%, 52.5%)
CIE-LAB	lab(23.90, 16.98, -42.18)
CIE-LCH	lch(23.90, 45.47, 291.93°)
OKLab	oklab(35.01% -0.0097 -0.1216)
OKLCH	oklch(35.01% 0.122 265.4)
XYZ	xyz(5.1300, 4.0689, 18.6005)
Luminance	0.0407 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3479 #79601B

analogous

#1B6379 #1B3479 #311B79

triadic

#1B3479 #791B34 #34791B

tetradic

#1B3479 #791B63 #79601B #1B7931

square

#1B3479 #791B63 #79601B #1B7931

split-complementary

#1B3479 #79311B #63791B

monochromatic

#060B19 #101E47 #1B3479 #264AAB #3B64D3

Accessibility & contrast

On white

11.58

#1B3479 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1B3479 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3479

11.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3479	#FFFFFF	#000000	##FFFFFF
##1B3479	1.00	11.58	1.81	11.58
#FFFFFF	11.58	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D7B

Deuteranopia (green-blind)

#003578

Tritanopia (blue-blind)

#004551

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3479;
/* rgb */ color: rgb(27, 52, 121);
/* oklch */ color: oklch(35.0% 0.122 265.4);

Tailwind

colors: {
  custom: {
    50: '#666ba0',
    500: '#1b3479',
    950: '#000000',
  },
}

SCSS

$custom: #1b3479;
$custom-light: #666ba0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3479",
  "rgb": {
    "r": 27,
    "g": 52,
    "b": 121
  },
  "hsl": {
    "h": 224.043,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.35011,
    "c": 0.12196,
    "h": 265.4
  },
  "luminance": 0.04069
}

Semantic roles & 50–950 ramp

primary

#1B3479

secondary

#AD9143

accent

#BB41E7

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07060F

muted

#7A7A7E

Preview Lab

Preview with #1B3479

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

Preview Lab → · Contrast checker → · Palette generator →