#1B3383#1B3383

#1B3383 is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.7% C 0.138 H 266.5°. Best body text is #FFFFFF at 11.36:1 contrast (WCAG AA passes).

Color values

HEX	#1B3383
RGB	rgb(27, 51, 131)
HSL	hsl(226, 66%, 31%)
HSV	hsv(226, 79%, 51%)
CMYK	cmyk(79.4%, 61.1%, 0%, 48.6%)
CIE-LAB	lab(24.45, 21.73, -47.60)
CIE-LCH	lch(24.45, 52.33, 294.54°)
OKLab	oklab(35.68% -0.0085 -0.1375)
OKLCH	oklch(35.68% 0.138 266.5)
XYZ	xyz(5.7311, 4.2387, 21.9844)
Luminance	0.0424 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3383 #836B1B

analogous

#1B6783 #1B3383 #371B83

triadic

#1B3383 #831B33 #33831B

tetradic

#1B3383 #831B67 #836B1B #1B8337

square

#1B3383 #831B67 #836B1B #1B8337

split-complementary

#1B3383 #83371B #67831B

monochromatic

#060B1E #111F50 #1B3383 #2547B6 #4164D8

Accessibility & contrast

On white

11.36

#1B3383 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1B3383 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3383

11.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3383	#FFFFFF	#000000	##FFFFFF
##1B3383	1.00	11.36	1.85	11.36
#FFFFFF	11.36	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F86

Deuteranopia (green-blind)

#003581

Tritanopia (blue-blind)

#004755

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b3383;
/* rgb */ color: rgb(27, 51, 131);
/* oklch */ color: oklch(35.7% 0.138 266.5);

Tailwind

colors: {
  custom: {
    50: '#696aa8',
    500: '#1b3383',
    950: '#000000',
  },
}

SCSS

$custom: #1b3383;
$custom-light: #696aa8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3383",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 131
  },
  "hsl": {
    "h": 226.154,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.35683,
    "c": 0.13776,
    "h": 266.5
  },
  "luminance": 0.04239
}

Semantic roles & 50–950 ramp

primary

#1B3383

secondary

#B69C43

accent

#C23FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B3383

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

Preview Lab → · Contrast checker → · Palette generator →