#123E5B#123E5B

#123E5B is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 34.9% C 0.069 H 241.9°. Best body text is #FFFFFF at 11.26:1 contrast (WCAG AA passes).

Color values

HEX	#123E5B
RGB	rgb(18, 62, 91)
HSL	hsl(204, 67%, 21%)
HSV	hsv(204, 80%, 36%)
CMYK	cmyk(80.2%, 31.9%, 0%, 64.3%)
CIE-LAB	lab(24.73, -3.70, -21.57)
CIE-LCH	lch(24.73, 21.89, 260.27°)
OKLab	oklab(34.92% -0.0326 -0.061)
OKLCH	oklch(34.92% 0.069 241.9)
XYZ	xyz(3.8597, 4.3287, 10.5276)
Luminance	0.0433 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123E5B #5B2F12

analogous

#125B54 #123E5B #121A5B

triadic

#123E5B #5B123E #3E5B12

tetradic

#123E5B #54125B #5B2F12 #1A5B12

square

#123E5B #54125B #5B2F12 #1A5B12

split-complementary

#123E5B #5B121A #5B5412

monochromatic

#05111A #081B28 #123E5B #1C618E #2684C1

Accessibility & contrast

On white

11.26

#123E5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#123E5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123E5B

11.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123E5B	#FFFFFF	#000000	##FFFFFF
##123E5B	1.00	11.26	1.87	11.26
#FFFFFF	11.26	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313F5C

Deuteranopia (green-blind)

#26385A

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #123e5b;
/* rgb */ color: rgb(18, 62, 91);
/* oklch */ color: oklch(34.9% 0.069 241.9);

Tailwind

colors: {
  custom: {
    50: '#5c7389',
    500: '#123e5b',
    950: '#000000',
  },
}

SCSS

$custom: #123e5b;
$custom-light: #5c7389;
$custom-dark: #000000;

JSON

{
  "hex": "#123e5b",
  "rgb": {
    "r": 18,
    "g": 62,
    "b": 91
  },
  "hsl": {
    "h": 203.836,
    "s": 66.972,
    "l": 21.373
  },
  "oklch": {
    "l": 0.34915,
    "c": 0.06922,
    "h": 241.9
  },
  "luminance": 0.04329
}

Semantic roles & 50–950 ramp

primary

#123E5B

secondary

#935B35

accent

#823EEA

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#04080B

muted

#797B7C

Preview Lab

Preview with #123E5B

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

Preview Lab → · Contrast checker → · Palette generator →