#123F5A#123F5A

#123F5A is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.1% C 0.067 H 239.5°. Best body text is #FFFFFF at 11.14:1 contrast (WCAG AA passes).

Color values

HEX	#123F5A
RGB	rgb(18, 63, 90)
HSL	hsl(203, 67%, 21%)
HSV	hsv(203, 80%, 35%)
CMYK	cmyk(80%, 30%, 0%, 64.7%)
CIE-LAB	lab(25.02, -4.76, -20.47)
CIE-LCH	lch(25.02, 21.01, 256.90°)
OKLab	oklab(35.13% -0.0341 -0.0578)
OKLCH	oklch(35.13% 0.067 239.5)
XYZ	xyz(3.8717, 4.4213, 10.3202)
Luminance	0.0442 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#123F5A #5A2D12

analogous

#125A51 #123F5A #121B5A

triadic

#123F5A #5A123F #3F5A12

tetradic

#123F5A #51125A #5A2D12 #1B5A12

square

#123F5A #51125A #5A2D12 #1B5A12

split-complementary

#123F5A #5A121B #5A5112

monochromatic

#05121A #081B27 #123F5A #1C638D #2686C0

Accessibility & contrast

On white

11.14

#123F5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#123F5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #123F5A

11.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##123F5A	#FFFFFF	#000000	##FFFFFF
##123F5A	1.00	11.14	1.88	11.14
#FFFFFF	11.14	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#323F5B

Deuteranopia (green-blind)

#29385A

Tritanopia (blue-blind)

#004648

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #123f5a;
/* rgb */ color: rgb(18, 63, 90);
/* oklch */ color: oklch(35.1% 0.067 239.5);

Tailwind

colors: {
  custom: {
    50: '#5c7388',
    500: '#123f5a',
    950: '#000000',
  },
}

SCSS

$custom: #123f5a;
$custom-light: #5c7388;
$custom-dark: #000000;

JSON

{
  "hex": "#123f5a",
  "rgb": {
    "r": 18,
    "g": 63,
    "b": 90
  },
  "hsl": {
    "h": 202.5,
    "s": 66.667,
    "l": 21.176
  },
  "oklch": {
    "l": 0.35126,
    "c": 0.06713,
    "h": 239.5
  },
  "luminance": 0.04422
}

Semantic roles & 50–950 ramp

primary

#123F5A

secondary

#935835

accent

#7E3EEA

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#04080B

muted

#797B7C

Preview Lab

Preview with #123F5A

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

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