#173A7C#173A7C

#173A7C is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.4% C 0.120 H 261.6°. Best body text is #FFFFFF at 10.87:1 contrast (WCAG AA passes).

Color values

HEX	#173A7C
RGB	rgb(23, 58, 124)
HSL	hsl(219, 69%, 29%)
HSV	hsv(219, 81%, 49%)
CMYK	cmyk(81.5%, 53.2%, 0%, 51.4%)
CIE-LAB	lab(25.75, 13.47, -41.08)
CIE-LCH	lch(25.75, 43.23, 288.15°)
OKLab	oklab(36.45% -0.0175 -0.1183)
OKLCH	oklch(36.45% 0.12 261.6)
XYZ	xyz(5.5032, 4.6629, 19.6749)
Luminance	0.0466 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A7C #7C5917

analogous

#176D7C #173A7C #27177C

triadic

#173A7C #7C173A #3A7C17

tetradic

#173A7C #7C176D #7C5917 #177C27

square

#173A7C #7C176D #7C5917 #177C27

split-complementary

#173A7C #7C2717 #6D7C17

monochromatic

#050C1A #0D2248 #173A7C #2152B0 #346DD9

Accessibility & contrast

On white

10.87

#173A7C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#173A7C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A7C

10.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A7C	#FFFFFF	#000000	##FFFFFF
##173A7C	1.00	10.87	1.93	10.87
#FFFFFF	10.87	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.87	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E427E

Deuteranopia (green-blind)

#00397B

Tritanopia (blue-blind)

#004A55

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173a7c;
/* rgb */ color: rgb(23, 58, 124);
/* oklch */ color: oklch(36.4% 0.120 261.6);

Tailwind

colors: {
  custom: {
    50: '#666fa2',
    500: '#173a7c',
    950: '#000000',
  },
}

SCSS

$custom: #173a7c;
$custom-light: #666fa2;
$custom-dark: #000000;

JSON

{
  "hex": "#173a7c",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 124
  },
  "hsl": {
    "h": 219.208,
    "s": 68.707,
    "l": 28.824
  },
  "oklch": {
    "l": 0.36448,
    "c": 0.11958,
    "h": 261.6
  },
  "luminance": 0.04664
}

Semantic roles & 50–950 ramp

primary

#173A7C

secondary

#B1893E

accent

#AF3CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173A7C

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

Preview Lab → · Contrast checker → · Palette generator →