#1B2F83#1B2F83

#1B2F83 is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.9% C 0.143 H 267.7°. Best body text is #FFFFFF at 11.79:1 contrast (WCAG AA passes).

Color values

HEX	#1B2F83
RGB	rgb(27, 47, 131)
HSL	hsl(228, 66%, 31%)
HSV	hsv(228, 79%, 51%)
CMYK	cmyk(79.4%, 64.1%, 0%, 48.6%)
CIE-LAB	lab(23.35, 24.52, -49.38)
CIE-LCH	lch(23.35, 55.14, 296.40°)
OKLab	oklab(34.87% -0.0057 -0.1428)
OKLCH	oklch(34.87% 0.143 267.7)
XYZ	xyz(5.5638, 3.9041, 21.9287)
Luminance	0.0391 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2F83 #836F1B

analogous

#1B6383 #1B2F83 #3B1B83

triadic

#1B2F83 #831B2F #2F831B

tetradic

#1B2F83 #831B63 #836F1B #1B833B

square

#1B2F83 #831B63 #836F1B #1B833B

split-complementary

#1B2F83 #833B1B #63831B

monochromatic

#060B1E #111D50 #1B2F83 #2541B6 #415ED8

Accessibility & contrast

On white

11.79

#1B2F83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1B2F83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2F83

11.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2F83	#FFFFFF	#000000	##FFFFFF
##1B2F83	1.00	11.79	1.78	11.79
#FFFFFF	11.79	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D86

Deuteranopia (green-blind)

#003381

Tritanopia (blue-blind)

#004554

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b2f83;
/* rgb */ color: rgb(27, 47, 131);
/* oklch */ color: oklch(34.9% 0.143 267.7);

Tailwind

colors: {
  custom: {
    50: '#6967a8',
    500: '#1b2f83',
    950: '#000000',
  },
}

SCSS

$custom: #1b2f83;
$custom-light: #6967a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2f83",
  "rgb": {
    "r": 27,
    "g": 47,
    "b": 131
  },
  "hsl": {
    "h": 228.462,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.34871,
    "c": 0.1429,
    "h": 267.7
  },
  "luminance": 0.03905
}

Semantic roles & 50–950 ramp

primary

#1B2F83

secondary

#B6A043

accent

#C83FE9

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1B2F83

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

Preview Lab → · Contrast checker → · Palette generator →