#173B5E#173B5E

#173B5E is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.5% C 0.074 H 250.3°. Best body text is #FFFFFF at 11.52:1 contrast (WCAG AA passes).

Color values

HEX	#173B5E
RGB	rgb(23, 59, 94)
HSL	hsl(210, 61%, 23%)
HSV	hsv(210, 76%, 37%)
CMYK	cmyk(75.5%, 37.2%, 0%, 63.1%)
CIE-LAB	lab(24.06, 0.34, -24.57)
CIE-LCH	lch(24.06, 24.58, 270.79°)
OKLab	oklab(34.49% -0.025 -0.0698)
OKLCH	oklch(34.49% 0.074 250.3)
XYZ	xyz(3.9369, 4.1178, 11.1748)
Luminance	0.0412 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B5E #5E3A17

analogous

#175E5D #173B5E #17185E

triadic

#173B5E #5E173B #3B5E17

tetradic

#173B5E #5D175E #5E3A17 #185E17

square

#173B5E #5D175E #5E3A17 #185E17

split-complementary

#173B5E #5E1718 #5E5D17

monochromatic

#060F19 #0B1C2D #173B5E #235A8F #2F79C0

Accessibility & contrast

On white

11.52

#173B5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#173B5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B5E

11.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B5E	#FFFFFF	#000000	##FFFFFF
##173B5E	1.00	11.52	1.82	11.52
#FFFFFF	11.52	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B3D5F

Deuteranopia (green-blind)

#21365D

Tritanopia (blue-blind)

#004348

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173b5e;
/* rgb */ color: rgb(23, 59, 94);
/* oklch */ color: oklch(34.5% 0.074 250.3);

Tailwind

colors: {
  custom: {
    50: '#5e708c',
    500: '#173b5e',
    950: '#000000',
  },
}

SCSS

$custom: #173b5e;
$custom-light: #5e708c;
$custom-dark: #000000;

JSON

{
  "hex": "#173b5e",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 94
  },
  "hsl": {
    "h": 209.577,
    "s": 60.684,
    "l": 22.941
  },
  "oklch": {
    "l": 0.34489,
    "c": 0.07412,
    "h": 250.3
  },
  "luminance": 0.04118
}

Semantic roles & 50–950 ramp

primary

#173B5E

secondary

#95683C

accent

#9344E4

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #173B5E

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

Preview Lab → · Contrast checker → · Palette generator →