#1B3788#1B3788

#1B3788 is a dark, vivid blue. Relative luminance 0.047; OKLCH L 37.0% C 0.140 H 265.4°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#1B3788
RGB	rgb(27, 55, 136)
HSL	hsl(225, 67%, 32%)
HSV	hsv(225, 80%, 53%)
CMYK	cmyk(80.1%, 59.6%, 0%, 46.7%)
CIE-LAB	lab(25.99, 20.95, -48.21)
CIE-LCH	lch(25.99, 52.56, 293.49°)
OKLab	oklab(36.97% -0.0111 -0.1392)
OKLCH	oklch(36.97% 0.14 265.4)
XYZ	xyz(6.2605, 4.7422, 23.8732)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3788 #886C1B

analogous

#1B6E88 #1B3788 #361B88

triadic

#1B3788 #881B37 #37881B

tetradic

#1B3788 #881B6E #886C1B #1B8836

square

#1B3788 #881B6E #886C1B #1B8836

split-complementary

#1B3788 #88361B #6E881B

monochromatic

#070E22 #112255 #1B3788 #254CBB #446ADA

Accessibility & contrast

On white

10.78

#1B3788 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1B3788 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3788

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3788	#FFFFFF	#000000	##FFFFFF
##1B3788	1.00	10.78	1.95	10.78
#FFFFFF	10.78	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438B

Deuteranopia (green-blind)

#003986

Tritanopia (blue-blind)

#004B5A

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3788;
/* rgb */ color: rgb(27, 55, 136);
/* oklch */ color: oklch(37.0% 0.140 265.4);

Tailwind

colors: {
  custom: {
    50: '#6a6dab',
    500: '#1b3788',
    950: '#000000',
  },
}

SCSS

$custom: #1b3788;
$custom-light: #6a6dab;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3788",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 136
  },
  "hsl": {
    "h": 224.587,
    "s": 66.871,
    "l": 31.961
  },
  "oklch": {
    "l": 0.3697,
    "c": 0.13967,
    "h": 265.4
  },
  "luminance": 0.04743
}

Semantic roles & 50–950 ramp

primary

#1B3788

secondary

#BB9C44

accent

#BE3EEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B3788

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

Preview Lab → · Contrast checker → · Palette generator →