#1B405B#1B405B

#1B405B is a dark, moderate cyan. Relative luminance 0.047; OKLCH L 35.8% C 0.063 H 243.0°. Best body text is #FFFFFF at 10.88:1 contrast (WCAG AA passes).

Color values

HEX	#1B405B
RGB	rgb(27, 64, 91)
HSL	hsl(205, 54%, 23%)
HSV	hsv(205, 70%, 36%)
CMYK	cmyk(70.3%, 29.7%, 0%, 64.3%)
CIE-LAB	lab(25.73, -3.47, -19.99)
CIE-LCH	lch(25.73, 20.28, 260.15°)
OKLab	oklab(35.8% -0.0287 -0.0563)
OKLCH	oklch(35.8% 0.063 243)
XYZ	xyz(4.1730, 4.6547, 10.5740)
Luminance	0.0466 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B405B #5B361B

analogous

#1B5B56 #1B405B #1B205B

triadic

#1B405B #5B1B40 #405B1B

tetradic

#1B405B #561B5B #5B361B #205B1B

square

#1B405B #561B5B #5B361B #205B1B

split-complementary

#1B405B #5B1B20 #5B561B

monochromatic

#071118 #0D1F2C #1B405B #29618A #3782B9

Accessibility & contrast

On white

10.88

#1B405B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#1B405B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B405B

10.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B405B	#FFFFFF	#000000	##FFFFFF
##1B405B	1.00	10.88	1.93	10.88
#FFFFFF	10.88	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#34405C

Deuteranopia (green-blind)

#2B3A5B

Tritanopia (blue-blind)

#004749

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b405b;
/* rgb */ color: rgb(27, 64, 91);
/* oklch */ color: oklch(35.8% 0.063 243.0);

Tailwind

colors: {
  custom: {
    50: '#5f7489',
    500: '#1b405b',
    950: '#000000',
  },
}

SCSS

$custom: #1b405b;
$custom-light: #5f7489;
$custom-dark: #000000;

JSON

{
  "hex": "#1b405b",
  "rgb": {
    "r": 27,
    "g": 64,
    "b": 91
  },
  "hsl": {
    "h": 205.313,
    "s": 54.237,
    "l": 23.137
  },
  "oklch": {
    "l": 0.35795,
    "c": 0.06321,
    "h": 243
  },
  "luminance": 0.04655
}

Semantic roles & 50–950 ramp

primary

#1B405B

secondary

#916341

accent

#884ADE

background

#F5F7F8

surface

#EAEDF0

border

#C6C8CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #1B405B

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

Preview Lab → · Contrast checker → · Palette generator →