#173B79#173B79

#173B79 is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.4% C 0.114 H 260.5°. Best body text is #FFFFFF at 10.83:1 contrast (WCAG AA passes).

Color values

HEX	#173B79
RGB	rgb(23, 59, 121)
HSL	hsl(218, 68%, 28%)
HSV	hsv(218, 81%, 47%)
CMYK	cmyk(81%, 51.2%, 0%, 52.5%)
CIE-LAB	lab(25.83, 11.51, -39.06)
CIE-LCH	lch(25.83, 40.72, 286.42°)
OKLab	oklab(36.44% -0.0188 -0.1123)
OKLCH	oklch(36.44% 0.114 260.5)
XYZ	xyz(5.3673, 4.6899, 18.7078)
Luminance	0.0469 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B79 #795517

analogous

#176C79 #173B79 #241779

triadic

#173B79 #79173B #3B7917

tetradic

#173B79 #79176C #795517 #177924

square

#173B79 #79176C #795517 #177924

split-complementary

#173B79 #792417 #6C7917

monochromatic

#050D1A #0D2246 #173B79 #2154AC #326FD8

Accessibility & contrast

On white

10.83

#173B79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#173B79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B79

10.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B79	#FFFFFF	#000000	##FFFFFF
##173B79	1.00	10.83	1.94	10.83
#FFFFFF	10.83	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#16427B

Deuteranopia (green-blind)

#003978

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173b79;
/* rgb */ color: rgb(23, 59, 121);
/* oklch */ color: oklch(36.4% 0.114 260.5);

Tailwind

colors: {
  custom: {
    50: '#6570a0',
    500: '#173b79',
    950: '#000000',
  },
}

SCSS

$custom: #173b79;
$custom-light: #6570a0;
$custom-dark: #000000;

JSON

{
  "hex": "#173b79",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 121
  },
  "hsl": {
    "h": 217.959,
    "s": 68.056,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36438,
    "c": 0.11388,
    "h": 260.5
  },
  "luminance": 0.04691
}

Semantic roles & 50–950 ramp

primary

#173B79

secondary

#AE853E

accent

#AB3DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070F

muted

#7A7A7E

Preview Lab

Preview with #173B79

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

Preview Lab → · Contrast checker → · Palette generator →