#1B3A87#1B3A87

#1B3A87 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.5% C 0.134 H 264.3°. Best body text is #FFFFFF at 10.49:1 contrast (WCAG AA passes).

Color values

HEX	#1B3A87
RGB	rgb(27, 58, 135)
HSL	hsl(223, 67%, 32%)
HSV	hsv(223, 80%, 53%)
CMYK	cmyk(80%, 57%, 0%, 47.1%)
CIE-LAB	lab(26.76, 18.45, -46.33)
CIE-LCH	lch(26.76, 49.87, 291.71°)
OKLab	oklab(37.52% -0.0134 -0.1337)
OKLCH	oklch(37.52% 0.134 264.3)
XYZ	xyz(6.3367, 5.0077, 23.5496)
Luminance	0.0501 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3A87 #87681B

analogous

#1B7087 #1B3A87 #321B87

triadic

#1B3A87 #871B3A #3A871B

tetradic

#1B3A87 #871B70 #87681B #1B8732

square

#1B3A87 #871B70 #87681B #1B8732

split-complementary

#1B3A87 #87321B #70871B

monochromatic

#070E21 #112454 #1B3A87 #2550BA #436ED9

Accessibility & contrast

On white

10.49

#1B3A87 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1B3A87 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3A87

10.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3A87	#FFFFFF	#000000	##FFFFFF
##1B3A87	1.00	10.49	2.00	10.49
#FFFFFF	10.49	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448A

Deuteranopia (green-blind)

#003A85

Tritanopia (blue-blind)

#004D5A

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3a87;
/* rgb */ color: rgb(27, 58, 135);
/* oklch */ color: oklch(37.5% 0.134 264.3);

Tailwind

colors: {
  custom: {
    50: '#6a6fab',
    500: '#1b3a87',
    950: '#000000',
  },
}

SCSS

$custom: #1b3a87;
$custom-light: #6a6fab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3a87",
  "rgb": {
    "r": 27,
    "g": 58,
    "b": 135
  },
  "hsl": {
    "h": 222.778,
    "s": 66.667,
    "l": 31.765
  },
  "oklch": {
    "l": 0.37522,
    "c": 0.13434,
    "h": 264.3
  },
  "luminance": 0.05008
}

Semantic roles & 50–950 ramp

primary

#1B3A87

secondary

#BA9844

accent

#B83EEA

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #1B3A87

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

Preview Lab → · Contrast checker → · Palette generator →