#123E5A#123E5A

#123E5A is a dark, moderate cyan. Relative luminance 0.043; OKLCH L 34.9% C 0.068 H 240.9°. Best body text is #FFFFFF at 11.28:1 contrast (WCAG AA passes).

Color values

HEX	#123E5A
RGB	rgb(18, 62, 90)
HSL	hsl(203, 67%, 21%)
HSV	hsv(203, 80%, 35%)
CMYK	cmyk(80%, 31.1%, 0%, 64.7%)
CIE-LAB	lab(24.68, -4.11, -21.00)
CIE-LCH	lch(24.68, 21.40, 258.94°)
OKLab	oklab(34.86% -0.033 -0.0594)
OKLCH	oklch(34.86% 0.068 240.9)
XYZ	xyz(3.8168, 4.3116, 10.3019)
Luminance	0.0431 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123E5A #5A2E12

analogous

#125A52 #123E5A #121A5A

triadic

#123E5A #5A123E #3E5A12

tetradic

#123E5A #52125A #5A2E12 #1A5A12

square

#123E5A #52125A #5A2E12 #1A5A12

split-complementary

#123E5A #5A121A #5A5212

monochromatic

#05121A #081B27 #123E5A #1C618D #2684C0

Accessibility & contrast

On white

11.28

#123E5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#123E5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123E5A

11.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123E5A	#FFFFFF	#000000	##FFFFFF
##123E5A	1.00	11.28	1.86	11.28
#FFFFFF	11.28	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313E5B

Deuteranopia (green-blind)

#273859

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #123e5a;
/* rgb */ color: rgb(18, 62, 90);
/* oklch */ color: oklch(34.9% 0.068 240.9);

Tailwind

colors: {
  custom: {
    50: '#5c7389',
    500: '#123e5a',
    950: '#000000',
  },
}

SCSS

$custom: #123e5a;
$custom-light: #5c7389;
$custom-dark: #000000;

JSON

{
  "hex": "#123e5a",
  "rgb": {
    "r": 18,
    "g": 62,
    "b": 90
  },
  "hsl": {
    "h": 203.333,
    "s": 66.667,
    "l": 21.176
  },
  "oklch": {
    "l": 0.34855,
    "c": 0.06795,
    "h": 240.9
  },
  "luminance": 0.04312
}

Semantic roles & 50–950 ramp

primary

#123E5A

secondary

#935A35

accent

#813EEA

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#04080B

muted

#797B7C

Preview Lab

Preview with #123E5A

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

Preview Lab → · Contrast checker → · Palette generator →