#1B3480#1B3480

#1B3480 is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.6% C 0.132 H 266.0°. Best body text is #FFFFFF at 11.35:1 contrast (WCAG AA passes).

Color values

HEX	#1B3480
RGB	rgb(27, 52, 128)
HSL	hsl(225, 65%, 30%)
HSV	hsv(225, 79%, 50%)
CMYK	cmyk(78.9%, 59.4%, 0%, 49.8%)
CIE-LAB	lab(24.47, 19.82, -45.67)
CIE-LCH	lch(24.47, 49.79, 293.46°)
OKLab	oklab(35.62% -0.0093 -0.1318)
OKLCH	oklch(35.62% 0.132 266)
XYZ	xyz(5.5749, 4.2469, 20.9438)
Luminance	0.0425 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3480 #80671B

analogous

#1B6680 #1B3480 #351B80

triadic

#1B3480 #801B34 #34801B

tetradic

#1B3480 #801B66 #80671B #1B8035

square

#1B3480 #801B66 #80671B #1B8035

split-complementary

#1B3480 #80351B #66801B

monochromatic

#060B1B #101F4D #1B3480 #2649B3 #3F64D6

Accessibility & contrast

On white

11.35

#1B3480 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1B3480 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3480

11.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3480	#FFFFFF	#000000	##FFFFFF
##1B3480	1.00	11.35	1.85	11.35
#FFFFFF	11.35	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F83

Deuteranopia (green-blind)

#00367F

Tritanopia (blue-blind)

#004754

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b3480;
/* rgb */ color: rgb(27, 52, 128);
/* oklch */ color: oklch(35.6% 0.132 266.0);

Tailwind

colors: {
  custom: {
    50: '#686ba5',
    500: '#1b3480',
    950: '#000000',
  },
}

SCSS

$custom: #1b3480;
$custom-light: #686ba5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3480",
  "rgb": {
    "r": 27,
    "g": 52,
    "b": 128
  },
  "hsl": {
    "h": 225.149,
    "s": 65.161,
    "l": 30.392
  },
  "oklch": {
    "l": 0.35623,
    "c": 0.13216,
    "h": 266
  },
  "luminance": 0.04248
}

Semantic roles & 50–950 ramp

primary

#1B3480

secondary

#B49843

accent

#BE40E8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B3480

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

Preview Lab → · Contrast checker → · Palette generator →