#1B3B89#1B3B89

#1B3B89 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.9% C 0.136 H 264.1°. Best body text is #FFFFFF at 10.33:1 contrast (WCAG AA passes).

Color values

HEX	#1B3B89
RGB	rgb(27, 59, 137)
HSL	hsl(223, 67%, 32%)
HSV	hsv(223, 80%, 54%)
CMYK	cmyk(80.3%, 56.9%, 0%, 46.3%)
CIE-LAB	lab(27.20, 18.56, -46.85)
CIE-LCH	lch(27.20, 50.39, 291.61°)
OKLab	oklab(37.91% -0.014 -0.1352)
OKLCH	oklch(37.91% 0.136 264.1)
XYZ	xyz(6.5297, 5.1663, 24.3151)
Luminance	0.0517 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3B89 #89691B

analogous

#1B7289 #1B3B89 #321B89

triadic

#1B3B89 #891B3B #3B891B

tetradic

#1B3B89 #891B72 #89691B #1B8932

square

#1B3B89 #891B72 #89691B #1B8932

split-complementary

#1B3B89 #89321B #72891B

monochromatic

#070F23 #112556 #1B3B89 #2551BC #4470DA

Accessibility & contrast

On white

10.33

#1B3B89 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1B3B89 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3B89

10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3B89	#FFFFFF	#000000	##FFFFFF
##1B3B89	1.00	10.33	2.03	10.33
#FFFFFF	10.33	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468C

Deuteranopia (green-blind)

#003B87

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3b89;
/* rgb */ color: rgb(27, 59, 137);
/* oklch */ color: oklch(37.9% 0.136 264.1);

Tailwind

colors: {
  custom: {
    50: '#6a70ac',
    500: '#1b3b89',
    950: '#000000',
  },
}

SCSS

$custom: #1b3b89;
$custom-light: #6a70ac;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3b89",
  "rgb": {
    "r": 27,
    "g": 59,
    "b": 137
  },
  "hsl": {
    "h": 222.545,
    "s": 67.073,
    "l": 32.157
  },
  "oklch": {
    "l": 0.3791,
    "c": 0.13589,
    "h": 264.1
  },
  "luminance": 0.05167
}

Semantic roles & 50–950 ramp

primary

#1B3B89

secondary

#BC9944

accent

#B83EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3B89

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

Preview Lab → · Contrast checker → · Palette generator →