#173B80#173B80

#173B80 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.0% C 0.124 H 261.7°. Best body text is #FFFFFF at 10.64:1 contrast (WCAG AA passes).

Color values

HEX	#173B80
RGB	rgb(23, 59, 128)
HSL	hsl(219, 70%, 30%)
HSV	hsv(219, 82%, 50%)
CMYK	cmyk(82%, 53.9%, 0%, 49.8%)
CIE-LAB	lab(26.36, 14.42, -42.62)
CIE-LCH	lch(26.36, 45.00, 288.69°)
OKLab	oklab(37% -0.0178 -0.1228)
OKLCH	oklch(37% 0.124 261.7)
XYZ	xyz(5.8122, 4.8679, 21.0512)
Luminance	0.0487 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B80 #805C17

analogous

#176F80 #173B80 #281780

triadic

#173B80 #80173B #3B8017

tetradic

#173B80 #80176F #805C17 #178028

square

#173B80 #80176F #805C17 #178028

split-complementary

#173B80 #802817 #6F8017

monochromatic

#050C1A #0E234C #173B80 #2053B4 #366FDB

Accessibility & contrast

On white

10.64

#173B80 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#173B80 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B80

10.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B80	#FFFFFF	#000000	##FFFFFF
##173B80	1.00	10.64	1.97	10.64
#FFFFFF	10.64	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A4382

Deuteranopia (green-blind)

#003A7F

Tritanopia (blue-blind)

#004C57

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173b80;
/* rgb */ color: rgb(23, 59, 128);
/* oklch */ color: oklch(37.0% 0.124 261.7);

Tailwind

colors: {
  custom: {
    50: '#6770a5',
    500: '#173b80',
    950: '#000000',
  },
}

SCSS

$custom: #173b80;
$custom-light: #6770a5;
$custom-dark: #000000;

JSON

{
  "hex": "#173b80",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 128
  },
  "hsl": {
    "h": 219.429,
    "s": 69.536,
    "l": 29.608
  },
  "oklch": {
    "l": 0.37004,
    "c": 0.12409,
    "h": 261.7
  },
  "luminance": 0.04869
}

Semantic roles & 50–950 ramp

primary

#173B80

secondary

#B48C3E

accent

#B03BEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173B80

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

Preview Lab → · Contrast checker → · Palette generator →