#123D5B#123D5B

#123D5B is a dark, moderate cyan. Relative luminance 0.042; OKLCH L 34.6% C 0.070 H 243.2°. Best body text is #FFFFFF at 11.39:1 contrast (WCAG AA passes).

Color values

HEX	#123D5B
RGB	rgb(18, 61, 91)
HSL	hsl(205, 67%, 21%)
HSV	hsv(205, 80%, 36%)
CMYK	cmyk(80.2%, 33%, 0%, 64.3%)
CIE-LAB	lab(24.39, -3.03, -22.11)
CIE-LCH	lch(24.39, 22.31, 262.18°)
OKLab	oklab(34.65% -0.0316 -0.0626)
OKLCH	oklch(34.65% 0.07 243.2)
XYZ	xyz(3.8058, 4.2210, 10.5097)
Luminance	0.0422 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123D5B #5B3012

analogous

#125B55 #123D5B #12195B

triadic

#123D5B #5B123D #3D5B12

tetradic

#123D5B #55125B #5B3012 #195B12

square

#123D5B #55125B #5B3012 #195B12

split-complementary

#123D5B #5B1219 #5B5512

monochromatic

#05111A #081B28 #123D5B #1C5F8E #2681C1

Accessibility & contrast

On white

11.39

#123D5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#123D5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123D5B

11.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123D5B	#FFFFFF	#000000	##FFFFFF
##123D5B	1.00	11.39	1.84	11.39
#FFFFFF	11.39	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F3E5C

Deuteranopia (green-blind)

#25375A

Tritanopia (blue-blind)

#004448

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #123d5b;
/* rgb */ color: rgb(18, 61, 91);
/* oklch */ color: oklch(34.6% 0.070 243.2);

Tailwind

colors: {
  custom: {
    50: '#5c7289',
    500: '#123d5b',
    950: '#000000',
  },
}

SCSS

$custom: #123d5b;
$custom-light: #5c7289;
$custom-dark: #000000;

JSON

{
  "hex": "#123d5b",
  "rgb": {
    "r": 18,
    "g": 61,
    "b": 91
  },
  "hsl": {
    "h": 204.658,
    "s": 66.972,
    "l": 21.373
  },
  "oklch": {
    "l": 0.34646,
    "c": 0.07011,
    "h": 243.2
  },
  "luminance": 0.04221
}

Semantic roles & 50–950 ramp

primary

#123D5B

secondary

#935C35

accent

#853EEA

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#04070B

muted

#797A7C

Preview Lab

Preview with #123D5B

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

Preview Lab → · Contrast checker → · Palette generator →