#173B7C#173B7C

#173B7C is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.7% C 0.118 H 261.1°. Best body text is #FFFFFF at 10.75:1 contrast (WCAG AA passes).

Color values

HEX	#173B7C
RGB	rgb(23, 59, 124)
HSL	hsl(219, 69%, 29%)
HSV	hsv(219, 81%, 49%)
CMYK	cmyk(81.5%, 52.4%, 0%, 51.4%)
CIE-LAB	lab(26.05, 12.76, -40.60)
CIE-LCH	lch(26.05, 42.55, 287.45°)
OKLab	oklab(36.68% -0.0184 -0.1168)
OKLCH	oklch(36.68% 0.118 261.1)
XYZ	xyz(5.5541, 4.7647, 19.6918)
Luminance	0.0476 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B7C #7C5817

analogous

#176E7C #173B7C #26177C

triadic

#173B7C #7C173B #3B7C17

tetradic

#173B7C #7C176E #7C5817 #177C26

square

#173B7C #7C176E #7C5817 #177C26

split-complementary

#173B7C #7C2617 #6E7C17

monochromatic

#050C1A #0D2248 #173B7C #2154B0 #346FD9

Accessibility & contrast

On white

10.75

#173B7C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#173B7C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B7C

10.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B7C	#FFFFFF	#000000	##FFFFFF
##173B7C	1.00	10.75	1.95	10.75
#FFFFFF	10.75	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#12437E

Deuteranopia (green-blind)

#00397B

Tritanopia (blue-blind)

#004B55

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173b7c;
/* rgb */ color: rgb(23, 59, 124);
/* oklch */ color: oklch(36.7% 0.118 261.1);

Tailwind

colors: {
  custom: {
    50: '#6570a2',
    500: '#173b7c',
    950: '#000000',
  },
}

SCSS

$custom: #173b7c;
$custom-light: #6570a2;
$custom-dark: #000000;

JSON

{
  "hex": "#173b7c",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 124
  },
  "hsl": {
    "h": 218.614,
    "s": 68.707,
    "l": 28.824
  },
  "oklch": {
    "l": 0.36678,
    "c": 0.11827,
    "h": 261.1
  },
  "luminance": 0.04765
}

Semantic roles & 50–950 ramp

primary

#173B7C

secondary

#B1883E

accent

#AD3CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173B7C

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

Preview Lab → · Contrast checker → · Palette generator →