#1B318A#1B318A

#1B318A is a dark, vivid blue. Relative luminance 0.043; OKLCH L 35.9% C 0.150 H 267.3°. Best body text is #FFFFFF at 11.33:1 contrast (WCAG AA passes).

Color values

HEX	#1B318A
RGB	rgb(27, 49, 138)
HSL	hsl(228, 67%, 32%)
HSV	hsv(228, 80%, 54%)
CMYK	cmyk(80.4%, 64.5%, 0%, 45.9%)
CIE-LAB	lab(24.53, 25.90, -51.84)
CIE-LCH	lch(24.53, 57.95, 296.55°)
OKLab	oklab(35.94% -0.0071 -0.15)
OKLCH	oklch(35.94% 0.15 267.3)
XYZ	xyz(6.1362, 4.2639, 24.5394)
Luminance	0.0427 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B318A #8A741B

analogous

#1B698A #1B318A #3C1B8A

triadic

#1B318A #8A1B31 #318A1B

tetradic

#1B318A #8A1B69 #8A741B #1B8A3C

square

#1B318A #8A1B69 #8A741B #1B8A3C

split-complementary

#1B318A #8A3C1B #698A1B

monochromatic

#070D24 #111F57 #1B318A #2543BD #4563DB

Accessibility & contrast

On white

11.33

#1B318A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1B318A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B318A

11.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B318A	#FFFFFF	#000000	##FFFFFF
##1B318A	1.00	11.33	1.85	11.33
#FFFFFF	11.33	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00408D

Deuteranopia (green-blind)

#003588

Tritanopia (blue-blind)

#004858

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b318a;
/* rgb */ color: rgb(27, 49, 138);
/* oklch */ color: oklch(35.9% 0.150 267.3);

Tailwind

colors: {
  custom: {
    50: '#6b68ad',
    500: '#1b318a',
    950: '#000000',
  },
}

SCSS

$custom: #1b318a;
$custom-light: #6b68ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b318a",
  "rgb": {
    "r": 27,
    "g": 49,
    "b": 138
  },
  "hsl": {
    "h": 228.108,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.35936,
    "c": 0.15013,
    "h": 267.3
  },
  "luminance": 0.04265
}

Semantic roles & 50–950 ramp

primary

#1B318A

secondary

#BCA445

accent

#C83EEA

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1B318A

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

Preview Lab → · Contrast checker → · Palette generator →