#1B3283#1B3283

#1B3283 is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.5% C 0.139 H 266.8°. Best body text is #FFFFFF at 11.47:1 contrast (WCAG AA passes).

Color values

HEX	#1B3283
RGB	rgb(27, 50, 131)
HSL	hsl(227, 66%, 31%)
HSV	hsv(227, 79%, 51%)
CMYK	cmyk(79.4%, 61.8%, 0%, 48.6%)
CIE-LAB	lab(24.17, 22.43, -48.05)
CIE-LCH	lch(24.17, 53.03, 295.03°)
OKLab	oklab(35.48% -0.0078 -0.1388)
OKLCH	oklch(35.48% 0.139 266.8)
XYZ	xyz(5.6879, 4.1523, 21.9700)
Luminance	0.0415 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3283 #836C1B

analogous

#1B6683 #1B3283 #381B83

triadic

#1B3283 #831B32 #32831B

tetradic

#1B3283 #831B66 #836C1B #1B8338

square

#1B3283 #831B66 #836C1B #1B8338

split-complementary

#1B3283 #83381B #66831B

monochromatic

#060B1E #111F50 #1B3283 #2545B6 #4162D8

Accessibility & contrast

On white

11.47

#1B3283 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1B3283 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3283

11.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3283	#FFFFFF	#000000	##FFFFFF
##1B3283	1.00	11.47	1.83	11.47
#FFFFFF	11.47	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E86

Deuteranopia (green-blind)

#003581

Tritanopia (blue-blind)

#004755

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b3283;
/* rgb */ color: rgb(27, 50, 131);
/* oklch */ color: oklch(35.5% 0.139 266.8);

Tailwind

colors: {
  custom: {
    50: '#6969a8',
    500: '#1b3283',
    950: '#000000',
  },
}

SCSS

$custom: #1b3283;
$custom-light: #6969a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3283",
  "rgb": {
    "r": 27,
    "g": 50,
    "b": 131
  },
  "hsl": {
    "h": 226.731,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.35477,
    "c": 0.13906,
    "h": 266.8
  },
  "luminance": 0.04153
}

Semantic roles & 50–950 ramp

primary

#1B3283

secondary

#B69D43

accent

#C33FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B3283

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

Preview Lab → · Contrast checker → · Palette generator →