#1B308A#1B308A

#1B308A is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.7% C 0.151 H 267.5°. Best body text is #FFFFFF at 11.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B308A
RGB	rgb(27, 48, 138)
HSL	hsl(229, 67%, 32%)
HSV	hsv(229, 80%, 54%)
CMYK	cmyk(80.4%, 65.2%, 0%, 45.9%)
CIE-LAB	lab(24.26, 26.59, -52.27)
CIE-LCH	lch(24.26, 58.65, 296.96°)
OKLab	oklab(35.74% -0.0065 -0.1512)
OKLCH	oklch(35.74% 0.151 267.5)
XYZ	xyz(6.0948, 4.1812, 24.5257)
Luminance	0.0418 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B308A #8A751B

analogous

#1B678A #1B308A #3E1B8A

triadic

#1B308A #8A1B30 #308A1B

tetradic

#1B308A #8A1B67 #8A751B #1B8A3E

square

#1B308A #8A1B67 #8A751B #1B8A3E

split-complementary

#1B308A #8A3E1B #678A1B

monochromatic

#070C24 #111E57 #1B308A #2542BD #4561DB

Accessibility & contrast

On white

11.44

#1B308A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1B308A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B308A

11.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B308A	#FFFFFF	#000000	##FFFFFF
##1B308A	1.00	11.44	1.84	11.44
#FFFFFF	11.44	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F8D

Deuteranopia (green-blind)

#003588

Tritanopia (blue-blind)

#004858

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b308a;
/* rgb */ color: rgb(27, 48, 138);
/* oklch */ color: oklch(35.7% 0.151 267.5);

Tailwind

colors: {
  custom: {
    50: '#6b68ad',
    500: '#1b308a',
    950: '#000000',
  },
}

SCSS

$custom: #1b308a;
$custom-light: #6b68ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b308a",
  "rgb": {
    "r": 27,
    "g": 48,
    "b": 138
  },
  "hsl": {
    "h": 228.649,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.35741,
    "c": 0.15138,
    "h": 267.5
  },
  "luminance": 0.04182
}

Semantic roles & 50–950 ramp

primary

#1B308A

secondary

#BCA545

accent

#CA3EEA

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1B308A

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

Preview Lab → · Contrast checker → · Palette generator →