#123F4B#123F4B

#123F4B is a dark, muted cyan. Relative luminance 0.042; OKLCH L 34.3% C 0.052 H 219.0°. Best body text is #FFFFFF at 11.42:1 contrast (WCAG AA passes).

Color values

HEX	#123F4B
RGB	rgb(18, 63, 75)
HSL	hsl(193, 61%, 18%)
HSV	hsv(193, 76%, 29%)
CMYK	cmyk(76%, 16%, 0%, 70.6%)
CIE-LAB	lab(24.29, -10.62, -11.74)
CIE-LCH	lch(24.29, 15.83, 227.86°)
OKLab	oklab(34.31% -0.0404 -0.0327)
OKLCH	oklch(34.31% 0.052 219)
XYZ	xyz(3.2964, 4.1912, 7.2905)
Luminance	0.0419 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123F4B #4B1E12

analogous

#124B3A #123F4B #12224B

triadic

#123F4B #4B123F #3F4B12

tetradic

#123F4B #3A124B #4B1E12 #224B12

square

#123F4B #3A124B #4B1E12 #224B12

split-complementary

#123F4B #4B1222 #4B3A12

monochromatic

#061519 #06161A #123F4B #1E687C #2A92AE

Accessibility & contrast

On white

11.42

#123F4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#123F4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123F4B

11.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123F4B	#FFFFFF	#000000	##FFFFFF
##123F4B	1.00	11.42	1.84	11.42
#FFFFFF	11.42	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#373D4C

Deuteranopia (green-blind)

#2F374B

Tritanopia (blue-blind)

#004343

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #123f4b;
/* rgb */ color: rgb(18, 63, 75);
/* oklch */ color: oklch(34.3% 0.052 219.0);

Tailwind

colors: {
  custom: {
    50: '#59747d',
    500: '#123f4b',
    950: '#000000',
  },
}

SCSS

$custom: #123f4b;
$custom-light: #59747d;
$custom-dark: #000000;

JSON

{
  "hex": "#123f4b",
  "rgb": {
    "r": 18,
    "g": 63,
    "b": 75
  },
  "hsl": {
    "h": 192.632,
    "s": 61.29,
    "l": 18.235
  },
  "oklch": {
    "l": 0.34309,
    "c": 0.05201,
    "h": 219
  },
  "luminance": 0.04192
}

Semantic roles & 50–950 ramp

primary

#123F4B

secondary

#844535

accent

#6543E4

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#040809

muted

#797B7B

Preview Lab

Preview with #123F4B

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

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