#1B3A82#1B3A82

#1B3A82 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.1% C 0.127 H 263.8°. Best body text is #FFFFFF at 10.64:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A82
RGB	rgb(27, 58, 130)
HSL	hsl(222, 66%, 31%)
HSV	hsv(222, 79%, 51%)
CMYK	cmyk(79.2%, 55.4%, 0%, 49%)
CIE-LAB	lab(26.36, 16.42, -43.86)
CIE-LCH	lch(26.36, 46.83, 290.52°)
OKLab	oklab(37.1% -0.0138 -0.1264)
OKLCH	oklch(37.1% 0.127 263.8)
XYZ	xyz(5.9929, 4.8701, 21.7390)
Luminance	0.0487 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A82 #82631B

analogous

#1B6D82 #1B3A82 #2F1B82

triadic

#1B3A82 #821B3A #3A821B

tetradic

#1B3A82 #821B6D #82631B #1B822F

square

#1B3A82 #821B6D #82631B #1B822F

split-complementary

#1B3A82 #822F1B #6D821B

monochromatic

#060D1D #10234F #1B3A82 #2651B5 #406ED7

Accessibility & contrast

On white

10.64

#1B3A82 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1B3A82 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A82

10.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A82	#FFFFFF	#000000	##FFFFFF
##1B3A82	1.00	10.64	1.97	10.64
#FFFFFF	10.64	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#024385

Deuteranopia (green-blind)

#003A81

Tritanopia (blue-blind)

#004C58

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3a82;
/* rgb */ color: rgb(27, 58, 130);
/* oklch */ color: oklch(37.1% 0.127 263.8);

Tailwind

colors: {
  custom: {
    50: '#686fa7',
    500: '#1b3a82',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a82;
$custom-light: #686fa7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a82",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 130
  },
  "hsl": {
    "h": 221.942,
    "s": 65.605,
    "l": 30.784
  },
  "oklch": {
    "l": 0.37099,
    "c": 0.12713,
    "h": 263.8
  },
  "luminance": 0.04871
}

Semantic roles & 50–950 ramp

primary

#1B3A82

secondary

#B69343

accent

#B63FE9

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B3A82

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

Preview Lab → · Contrast checker → · Palette generator →