#1B387F#1B387F

#1B387F is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.4% C 0.125 H 264.3°. Best body text is #FFFFFF at 10.94:1 contrast (WCAG AA passes).

Color values

HEX	#1B387F
RGB	rgb(27, 56, 127)
HSL	hsl(223, 65%, 30%)
HSV	hsv(223, 79%, 50%)
CMYK	cmyk(78.7%, 55.9%, 0%, 50.2%)
CIE-LAB	lab(25.54, 16.60, -43.30)
CIE-LCH	lch(25.54, 46.38, 290.97°)
OKLab	oklab(36.4% -0.0125 -0.1248)
OKLCH	oklch(36.4% 0.125 264.3)
XYZ	xyz(5.6956, 4.5930, 20.6609)
Luminance	0.0459 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B387F #7F621B

analogous

#1B6A7F #1B387F #301B7F

triadic

#1B387F #7F1B38 #387F1B

tetradic

#1B387F #7F1B6A #7F621B #1B7F30

square

#1B387F #7F1B6A #7F621B #1B7F30

split-complementary

#1B387F #7F301B #6A7F1B

monochromatic

#060B1A #10224D #1B387F #264EB1 #3E6AD6

Accessibility & contrast

On white

10.94

#1B387F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#1B387F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B387F

10.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B387F	#FFFFFF	#000000	##FFFFFF
##1B387F	1.00	10.94	1.92	10.94
#FFFFFF	10.94	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004181

Deuteranopia (green-blind)

#00387E

Tritanopia (blue-blind)

#004955

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b387f;
/* rgb */ color: rgb(27, 56, 127);
/* oklch */ color: oklch(36.4% 0.125 264.3);

Tailwind

colors: {
  custom: {
    50: '#686ea5',
    500: '#1b387f',
    950: '#000000',
  },
}

SCSS

$custom: #1b387f;
$custom-light: #686ea5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b387f",
  "rgb": {
    "r": 27,
    "g": 56,
    "b": 127
  },
  "hsl": {
    "h": 222.6,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.36404,
    "c": 0.12542,
    "h": 264.3
  },
  "luminance": 0.04594
}

Semantic roles & 50–950 ramp

primary

#1B387F

secondary

#B39243

accent

#B740E8

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B387F

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

Preview Lab → · Contrast checker → · Palette generator →