#1B404F#1B404F

#1B404F is a dark, muted cyan. Relative luminance 0.045; OKLCH L 35.1% C 0.049 H 227.3°. Best body text is #FFFFFF at 11.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B404F
RGB	rgb(27, 64, 79)
HSL	hsl(197, 49%, 21%)
HSV	hsv(197, 66%, 31%)
CMYK	cmyk(65.8%, 19%, 0%, 69%)
CIE-LAB	lab(25.15, -7.97, -13.04)
CIE-LCH	lch(25.15, 15.28, 238.55°)
OKLab	oklab(35.14% -0.0336 -0.0363)
OKLCH	oklch(35.14% 0.049 227.3)
XYZ	xyz(3.6961, 4.4640, 8.0625)
Luminance	0.0446 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B404F #4F2A1B

analogous

#1B4F44 #1B404F #1B264F

triadic

#1B404F #4F1B40 #404F1B

tetradic

#1B404F #441B4F #4F2A1B #264F1B

square

#1B404F #441B4F #4F2A1B #264F1B

split-complementary

#1B404F #4F1B26 #4F441B

monochromatic

#081217 #0B1B21 #1B404F #2B657D #3A8AAA

Accessibility & contrast

On white

11.09

#1B404F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1B404F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B404F

11.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B404F	#FFFFFF	#000000	##FFFFFF
##1B404F	1.00	11.09	1.89	11.09
#FFFFFF	11.09	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#383F50

Deuteranopia (green-blind)

#31394F

Tritanopia (blue-blind)

#004445

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b404f;
/* rgb */ color: rgb(27, 64, 79);
/* oklch */ color: oklch(35.1% 0.049 227.3);

Tailwind

colors: {
  custom: {
    50: '#5d7480',
    500: '#1b404f',
    950: '#000000',
  },
}

SCSS

$custom: #1b404f;
$custom-light: #5d7480;
$custom-dark: #000000;

JSON

{
  "hex": "#1b404f",
  "rgb": {
    "r": 27,
    "g": 64,
    "b": 79
  },
  "hsl": {
    "h": 197.308,
    "s": 49.057,
    "l": 20.784
  },
  "oklch": {
    "l": 0.35145,
    "c": 0.04946,
    "h": 227.3
  },
  "luminance": 0.04464
}

Semantic roles & 50–950 ramp

primary

#1B404F

secondary

#855541

accent

#774FD9

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#04080A

muted

#797B7C

Preview Lab

Preview with #1B404F

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

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