#1B338B#1B338B

#1B338B is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.4% C 0.149 H 266.8°. Best body text is #FFFFFF at 11.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B338B
RGB	rgb(27, 51, 139)
HSL	hsl(227, 67%, 33%)
HSV	hsv(227, 81%, 55%)
CMYK	cmyk(80.6%, 63.3%, 0%, 45.5%)
CIE-LAB	lab(25.15, 24.92, -51.44)
CIE-LCH	lch(25.15, 57.16, 295.85°)
OKLab	oklab(36.43% -0.0084 -0.1488)
OKLCH	oklch(36.43% 0.149 266.8)
XYZ	xyz(6.2944, 4.4640, 24.9510)
Luminance	0.0447 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B338B #8B731B

analogous

#1B6B8B #1B338B #3B1B8B

triadic

#1B338B #8B1B33 #338B1B

tetradic

#1B338B #8B1B6B #8B731B #1B8B3B

square

#1B338B #8B1B6B #8B731B #1B8B3B

split-complementary

#1B338B #8B3B1B #6B8B1B

monochromatic

#070D25 #112058 #1B338B #2546BE #4565DB

Accessibility & contrast

On white

11.09

#1B338B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B338B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B338B

11.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B338B	#FFFFFF	#000000	##FFFFFF
##1B338B	1.00	11.09	1.89	11.09
#FFFFFF	11.09	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00418E

Deuteranopia (green-blind)

#003789

Tritanopia (blue-blind)

#004A5A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b338b;
/* rgb */ color: rgb(27, 51, 139);
/* oklch */ color: oklch(36.4% 0.149 266.8);

Tailwind

colors: {
  custom: {
    50: '#6b6aae',
    500: '#1b338b',
    950: '#000000',
  },
}

SCSS

$custom: #1b338b;
$custom-light: #6b6aae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b338b",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 139
  },
  "hsl": {
    "h": 227.143,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.36426,
    "c": 0.14901,
    "h": 266.8
  },
  "luminance": 0.04465
}

Semantic roles & 50–950 ramp

primary

#1B338B

secondary

#BCA345

accent

#C53DEA

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1B338B

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

Preview Lab → · Contrast checker → · Palette generator →