#123F5B#123F5B

#123F5B is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.2% C 0.068 H 240.4°. Best body text is #FFFFFF at 11.12:1 contrast (WCAG AA passes).

Color values

HEX	#123F5B
RGB	rgb(18, 63, 91)
HSL	hsl(203, 67%, 21%)
HSV	hsv(203, 80%, 36%)
CMYK	cmyk(80.2%, 30.8%, 0%, 64.3%)
CIE-LAB	lab(25.07, -4.36, -21.04)
CIE-LCH	lch(25.07, 21.48, 258.29°)
OKLab	oklab(35.19% -0.0337 -0.0595)
OKLCH	oklch(35.19% 0.068 240.4)
XYZ	xyz(3.9145, 4.4385, 10.5459)
Luminance	0.0444 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123F5B #5B2E12

analogous

#125B53 #123F5B #121B5B

triadic

#123F5B #5B123F #3F5B12

tetradic

#123F5B #53125B #5B2E12 #1B5B12

square

#123F5B #53125B #5B2E12 #1B5B12

split-complementary

#123F5B #5B121B #5B5312

monochromatic

#05121A #081C28 #123F5B #1C628E #2686C1

Accessibility & contrast

On white

11.12

#123F5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#123F5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123F5B

11.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123F5B	#FFFFFF	#000000	##FFFFFF
##123F5B	1.00	11.12	1.89	11.12
#FFFFFF	11.12	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323F5C

Deuteranopia (green-blind)

#28385A

Tritanopia (blue-blind)

#004649

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #123f5b;
/* rgb */ color: rgb(18, 63, 91);
/* oklch */ color: oklch(35.2% 0.068 240.4);

Tailwind

colors: {
  custom: {
    50: '#5c7389',
    500: '#123f5b',
    950: '#000000',
  },
}

SCSS

$custom: #123f5b;
$custom-light: #5c7389;
$custom-dark: #000000;

JSON

{
  "hex": "#123f5b",
  "rgb": {
    "r": 18,
    "g": 63,
    "b": 91
  },
  "hsl": {
    "h": 203.014,
    "s": 66.972,
    "l": 21.373
  },
  "oklch": {
    "l": 0.35186,
    "c": 0.06837,
    "h": 240.4
  },
  "luminance": 0.04439
}

Semantic roles & 50–950 ramp

primary

#123F5B

secondary

#935935

accent

#803EEA

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#04080B

muted

#797B7C

Preview Lab

Preview with #123F5B

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

Preview Lab → · Contrast checker → · Palette generator →