#173A78#173A78

#173A78 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.1% C 0.114 H 260.8°. Best body text is #FFFFFF at 10.98:1 contrast (WCAG AA passes).

Color values

HEX	#173A78
RGB	rgb(23, 58, 120)
HSL	hsl(218, 68%, 28%)
HSV	hsv(218, 81%, 47%)
CMYK	cmyk(80.8%, 51.7%, 0%, 52.9%)
CIE-LAB	lab(25.45, 11.80, -39.04)
CIE-LCH	lch(25.45, 40.79, 286.82°)
OKLab	oklab(36.13% -0.0181 -0.1123)
OKLCH	oklch(36.13% 0.114 260.8)
XYZ	xyz(5.2553, 4.5637, 18.3696)
Luminance	0.0456 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A78 #785517

analogous

#176A78 #173A78 #251778

triadic

#173A78 #78173A #3A7817

tetradic

#173A78 #78176A #785517 #177825

square

#173A78 #78176A #785517 #177825

split-complementary

#173A78 #782517 #6A7817

monochromatic

#050C1A #0D2145 #173A78 #2153AB #326ED8

Accessibility & contrast

On white

10.98

#173A78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#173A78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A78

10.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A78	#FFFFFF	#000000	##FFFFFF
##173A78	1.00	10.98	1.91	10.98
#FFFFFF	10.98	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	10.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#15417A

Deuteranopia (green-blind)

#003877

Tritanopia (blue-blind)

#004953

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173a78;
/* rgb */ color: rgb(23, 58, 120);
/* oklch */ color: oklch(36.1% 0.114 260.8);

Tailwind

colors: {
  custom: {
    50: '#646f9f',
    500: '#173a78',
    950: '#000000',
  },
}

SCSS

$custom: #173a78;
$custom-light: #646f9f;
$custom-dark: #000000;

JSON

{
  "hex": "#173a78",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 120
  },
  "hsl": {
    "h": 218.351,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.36125,
    "c": 0.11373,
    "h": 260.8
  },
  "luminance": 0.04564
}

Semantic roles & 50–950 ramp

primary

#173A78

secondary

#AD853E

accent

#AC3DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173A78

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

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