#1B388A#1B388A

#1B388A is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.4% C 0.141 H 265.2°. Best body text is #FFFFFF at 10.61:1 contrast (WCAG AA passes).

Color values

HEX	#1B388A
RGB	rgb(27, 56, 138)
HSL	hsl(224, 67%, 32%)
HSV	hsv(224, 80%, 54%)
CMYK	cmyk(80.4%, 59.4%, 0%, 45.9%)
CIE-LAB	lab(26.44, 21.05, -48.72)
CIE-LCH	lch(26.44, 53.08, 293.37°)
OKLab	oklab(37.36% -0.0118 -0.1407)
OKLCH	oklch(37.36% 0.141 265.2)
XYZ	xyz(6.4520, 4.8956, 24.6447)
Luminance	0.0490 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B388A #8A6D1B

analogous

#1B708A #1B388A #351B8A

triadic

#1B388A #8A1B38 #388A1B

tetradic

#1B388A #8A1B70 #8A6D1B #1B8A35

square

#1B388A #8A1B70 #8A6D1B #1B8A35

split-complementary

#1B388A #8A351B #708A1B

monochromatic

#070E24 #112357 #1B388A #254DBD #456CDB

Accessibility & contrast

On white

10.61

#1B388A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1B388A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B388A

10.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B388A	#FFFFFF	#000000	##FFFFFF
##1B388A	1.00	10.61	1.98	10.61
#FFFFFF	10.61	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448D

Deuteranopia (green-blind)

#003A88

Tritanopia (blue-blind)

#004D5B

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b388a;
/* rgb */ color: rgb(27, 56, 138);
/* oklch */ color: oklch(37.4% 0.141 265.2);

Tailwind

colors: {
  custom: {
    50: '#6b6ead',
    500: '#1b388a',
    950: '#000000',
  },
}

SCSS

$custom: #1b388a;
$custom-light: #6b6ead;
$custom-dark: #000000;

JSON

{
  "hex": "#1b388a",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 138
  },
  "hsl": {
    "h": 224.324,
    "s": 67.273,
    "l": 32.353
  },
  "oklch": {
    "l": 0.37358,
    "c": 0.14121,
    "h": 265.2
  },
  "luminance": 0.04896
}

Semantic roles & 50–950 ramp

primary

#1B388A

secondary

#BC9D45

accent

#BD3EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B388A

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

Preview Lab → · Contrast checker → · Palette generator →