#1B388B#1B388B

#1B388B is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.4% C 0.143 H 265.3°. Best body text is #FFFFFF at 10.58:1 contrast (WCAG AA passes).

Color values

HEX	#1B388B
RGB	rgb(27, 56, 139)
HSL	hsl(224, 67%, 33%)
HSV	hsv(224, 81%, 55%)
CMYK	cmyk(80.6%, 59.7%, 0%, 45.5%)
CIE-LAB	lab(26.52, 21.46, -49.20)
CIE-LCH	lch(26.52, 53.68, 293.56°)
OKLab	oklab(37.45% -0.0117 -0.1421)
OKLCH	oklch(37.45% 0.143 265.3)
XYZ	xyz(6.5247, 4.9247, 25.0278)
Luminance	0.0493 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B388B #8B6E1B

analogous

#1B708B #1B388B #361B8B

triadic

#1B388B #8B1B38 #388B1B

tetradic

#1B388B #8B1B70 #8B6E1B #1B8B36

square

#1B388B #8B1B70 #8B6E1B #1B8B36

split-complementary

#1B388B #8B361B #708B1B

monochromatic

#070F25 #112358 #1B388B #254DBE #456CDB

Accessibility & contrast

On white

10.58

#1B388B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#1B388B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B388B

10.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B388B	#FFFFFF	#000000	##FFFFFF
##1B388B	1.00	10.58	1.99	10.58
#FFFFFF	10.58	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448E

Deuteranopia (green-blind)

#003A89

Tritanopia (blue-blind)

#004D5C

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b388b;
/* rgb */ color: rgb(27, 56, 139);
/* oklch */ color: oklch(37.4% 0.143 265.3);

Tailwind

colors: {
  custom: {
    50: '#6b6eae',
    500: '#1b388b',
    950: '#000000',
  },
}

SCSS

$custom: #1b388b;
$custom-light: #6b6eae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b388b",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 139
  },
  "hsl": {
    "h": 224.464,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.37447,
    "c": 0.14262,
    "h": 265.3
  },
  "luminance": 0.04925
}

Semantic roles & 50–950 ramp

primary

#1B388B

secondary

#BC9E45

accent

#BE3DEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B388B

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

Preview Lab → · Contrast checker → · Palette generator →