#1B3F83#1B3F83

#1B3F83 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.3% C 0.122 H 261.6°. Best body text is #FFFFFF at 10.07:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F83
RGB	rgb(27, 63, 131)
HSL	hsl(219, 66%, 31%)
HSV	hsv(219, 79%, 51%)
CMYK	cmyk(79.4%, 51.9%, 0%, 48.6%)
CIE-LAB	lab(27.92, 13.32, -41.97)
CIE-LCH	lch(27.92, 44.03, 287.62°)
OKLab	oklab(38.31% -0.0178 -0.1207)
OKLCH	oklch(38.31% 0.122 261.6)
XYZ	xyz(6.3248, 5.4260, 22.1823)
Luminance	0.0543 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F83 #835F1B

analogous

#1B7383 #1B3F83 #2B1B83

triadic

#1B3F83 #831B3F #3F831B

tetradic

#1B3F83 #831B73 #835F1B #1B832B

square

#1B3F83 #831B73 #835F1B #1B832B

split-complementary

#1B3F83 #832B1B #73831B

monochromatic

#060E1E #112750 #1B3F83 #2557B6 #4175D8

Accessibility & contrast

On white

10.07

#1B3F83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#1B3F83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F83

10.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F83	#FFFFFF	#000000	##FFFFFF
##1B3F83	1.00	10.07	2.09	10.07
#FFFFFF	10.07	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#154785

Deuteranopia (green-blind)

#003D82

Tritanopia (blue-blind)

#004F5A

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1b3f83;
/* rgb */ color: rgb(27, 63, 131);
/* oklch */ color: oklch(38.3% 0.122 261.6);

Tailwind

colors: {
  custom: {
    50: '#6873a8',
    500: '#1b3f83',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f83;
$custom-light: #6873a8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f83",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 131
  },
  "hsl": {
    "h": 219.231,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.38305,
    "c": 0.12203,
    "h": 261.6
  },
  "luminance": 0.05427
}

Semantic roles & 50–950 ramp

primary

#1B3F83

secondary

#B68F43

accent

#AE3FE9

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B3F83

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

Preview Lab → · Contrast checker → · Palette generator →