#1B388D#1B388D

#1B388D is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.6% C 0.145 H 265.4°. Best body text is #FFFFFF at 10.52:1 contrast (WCAG AA passes).

Color values

HEX	#1B388D
RGB	rgb(27, 56, 141)
HSL	hsl(225, 68%, 33%)
HSV	hsv(225, 81%, 55%)
CMYK	cmyk(80.9%, 60.3%, 0%, 44.7%)
CIE-LAB	lab(26.69, 22.26, -50.17)
CIE-LCH	lch(26.69, 54.88, 293.93°)
OKLab	oklab(37.63% -0.0116 -0.145)
OKLCH	oklch(37.63% 0.145 265.4)
XYZ	xyz(6.6722, 4.9837, 25.8044)
Luminance	0.0498 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B388D #8D701B

analogous

#1B718D #1B388D #371B8D

triadic

#1B388D #8D1B38 #388D1B

tetradic

#1B388D #8D1B71 #8D701B #1B8D37

square

#1B388D #8D1B71 #8D701B #1B8D37

split-complementary

#1B388D #8D371B #718D1B

monochromatic

#070F26 #11245A #1B388D #254CC0 #476DDC

Accessibility & contrast

On white

10.52

#1B388D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1B388D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B388D

10.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B388D	#FFFFFF	#000000	##FFFFFF
##1B388D	1.00	10.52	2.00	10.52
#FFFFFF	10.52	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004590

Deuteranopia (green-blind)

#003A8B

Tritanopia (blue-blind)

#004E5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b388d;
/* rgb */ color: rgb(27, 56, 141);
/* oklch */ color: oklch(37.6% 0.145 265.4);

Tailwind

colors: {
  custom: {
    50: '#6b6eaf',
    500: '#1b388d',
    950: '#000000',
  },
}

SCSS

$custom: #1b388d;
$custom-light: #6b6eaf;
$custom-dark: #000000;

JSON

{
  "hex": "#1b388d",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 141
  },
  "hsl": {
    "h": 224.737,
    "s": 67.857,
    "l": 32.941
  },
  "oklch": {
    "l": 0.37626,
    "c": 0.14544,
    "h": 265.4
  },
  "luminance": 0.04984
}

Semantic roles & 50–950 ramp

primary

#1B388D

secondary

#BD9F46

accent

#BF3DEB

background

#F7F6FA

surface

#EDEBF5

border

#C8C6CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1B388D

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

Preview Lab → · Contrast checker → · Palette generator →