#123F5E#123F5E

#123F5E is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.4% C 0.072 H 243.1°. Best body text is #FFFFFF at 11.06:1 contrast (WCAG AA passes).

Color values

HEX	#123F5E
RGB	rgb(18, 63, 94)
HSL	hsl(204, 68%, 22%)
HSV	hsv(204, 81%, 37%)
CMYK	cmyk(80.9%, 33%, 0%, 63.1%)
CIE-LAB	lab(25.23, -3.14, -22.73)
CIE-LCH	lch(25.23, 22.95, 262.14°)
OKLab	oklab(35.37% -0.0327 -0.0644)
OKLCH	oklch(35.37% 0.072 243.1)
XYZ	xyz(4.0466, 4.4913, 11.2411)
Luminance	0.0449 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123F5E #5E3112

analogous

#125E57 #123F5E #12195E

triadic

#123F5E #5E123F #3F5E12

tetradic

#123F5E #57125E #5E3112 #195E12

square

#123F5E #57125E #5E3112 #195E12

split-complementary

#123F5E #5E1219 #5E5712

monochromatic

#05111A #081D2B #123F5E #1C6191 #2684C5

Accessibility & contrast

On white

11.06

#123F5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#123F5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123F5E

11.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123F5E	#FFFFFF	#000000	##FFFFFF
##123F5E	1.00	11.06	1.90	11.06
#FFFFFF	11.06	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#31405F

Deuteranopia (green-blind)

#26395D

Tritanopia (blue-blind)

#00474A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #123f5e;
/* rgb */ color: rgb(18, 63, 94);
/* oklch */ color: oklch(35.4% 0.072 243.1);

Tailwind

colors: {
  custom: {
    50: '#5c738c',
    500: '#123f5e',
    950: '#000000',
  },
}

SCSS

$custom: #123f5e;
$custom-light: #5c738c;
$custom-dark: #000000;

JSON

{
  "hex": "#123f5e",
  "rgb": {
    "r": 18,
    "g": 63,
    "b": 94
  },
  "hsl": {
    "h": 204.474,
    "s": 67.857,
    "l": 21.961
  },
  "oklch": {
    "l": 0.35368,
    "c": 0.07221,
    "h": 243.1
  },
  "luminance": 0.04492
}

Semantic roles & 50–950 ramp

primary

#123F5E

secondary

#965D35

accent

#843DEB

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#05080C

muted

#797B7D

Preview Lab

Preview with #123F5E

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

Preview Lab → · Contrast checker → · Palette generator →