#1B318B#1B318B

#1B318B is a dark, vivid blue. Relative luminance 0.043; OKLCH L 36.0% C 0.152 H 267.3°. Best body text is #FFFFFF at 11.30:1 contrast (WCAG AA passes).

Color values

HEX	#1B318B
RGB	rgb(27, 49, 139)
HSL	hsl(228, 67%, 33%)
HSV	hsv(228, 81%, 55%)
CMYK	cmyk(80.6%, 64.7%, 0%, 45.5%)
CIE-LAB	lab(24.62, 26.30, -52.31)
CIE-LCH	lch(24.62, 58.55, 296.69°)
OKLab	oklab(36.03% -0.0071 -0.1514)
OKLCH	oklch(36.03% 0.152 267.3)
XYZ	xyz(6.2089, 4.2930, 24.9225)
Luminance	0.0429 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B318B #8B751B

analogous

#1B698B #1B318B #3D1B8B

triadic

#1B318B #8B1B31 #318B1B

tetradic

#1B318B #8B1B69 #8B751B #1B8B3D

square

#1B318B #8B1B69 #8B751B #1B8B3D

split-complementary

#1B318B #8B3D1B #698B1B

monochromatic

#070D25 #111F58 #1B318B #2543BE #4563DB

Accessibility & contrast

On white

11.30

#1B318B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#1B318B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B318B

11.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B318B	#FFFFFF	#000000	##FFFFFF
##1B318B	1.00	11.30	1.86	11.30
#FFFFFF	11.30	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00408E

Deuteranopia (green-blind)

#003589

Tritanopia (blue-blind)

#004959

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b318b;
/* rgb */ color: rgb(27, 49, 139);
/* oklch */ color: oklch(36.0% 0.152 267.3);

Tailwind

colors: {
  custom: {
    50: '#6b68ae',
    500: '#1b318b',
    950: '#000000',
  },
}

SCSS

$custom: #1b318b;
$custom-light: #6b68ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b318b",
  "rgb": {
    "r": 27,
    "g": 49,
    "b": 139
  },
  "hsl": {
    "h": 228.214,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.36032,
    "c": 0.15152,
    "h": 267.3
  },
  "luminance": 0.04294
}

Semantic roles & 50–950 ramp

primary

#1B318B

secondary

#BCA545

accent

#C83DEA

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1B318B

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

Preview Lab → · Contrast checker → · Palette generator →