#173A7B#173A7B

#173A7B is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.4% C 0.118 H 261.4°. Best body text is #FFFFFF at 10.89:1 contrast (WCAG AA passes).

Color values

HEX	#173A7B
RGB	rgb(23, 58, 123)
HSL	hsl(219, 68%, 29%)
HSV	hsv(219, 81%, 48%)
CMYK	cmyk(81.3%, 52.8%, 0%, 51.8%)
CIE-LAB	lab(25.68, 13.05, -40.58)
CIE-LCH	lch(25.68, 42.62, 287.83°)
OKLab	oklab(36.37% -0.0177 -0.1168)
OKLCH	oklch(36.37% 0.118 261.4)
XYZ	xyz(5.4403, 4.6377, 19.3435)
Luminance	0.0464 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A7B #7B5817

analogous

#176C7B #173A7B #26177B

triadic

#173A7B #7B173A #3A7B17

tetradic

#173A7B #7B176C #7B5817 #177B26

square

#173A7B #7B176C #7B5817 #177B26

split-complementary

#173A7B #7B2617 #6C7B17

monochromatic

#050C1A #0D2247 #173A7B #2152AF #336DD9

Accessibility & contrast

On white

10.89

#173A7B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#173A7B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A7B

10.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A7B	#FFFFFF	#000000	##FFFFFF
##173A7B	1.00	10.89	1.93	10.89
#FFFFFF	10.89	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#10427D

Deuteranopia (green-blind)

#00397A

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173a7b;
/* rgb */ color: rgb(23, 58, 123);
/* oklch */ color: oklch(36.4% 0.118 261.4);

Tailwind

colors: {
  custom: {
    50: '#656fa2',
    500: '#173a7b',
    950: '#000000',
  },
}

SCSS

$custom: #173a7b;
$custom-light: #656fa2;
$custom-dark: #000000;

JSON

{
  "hex": "#173a7b",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 123
  },
  "hsl": {
    "h": 219,
    "s": 68.493,
    "l": 28.627
  },
  "oklch": {
    "l": 0.36366,
    "c": 0.11813,
    "h": 261.4
  },
  "luminance": 0.04638
}

Semantic roles & 50–950 ramp

primary

#173A7B

secondary

#B0883E

accent

#AE3CEB

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#06070F

muted

#7A7A7F

Preview Lab

Preview with #173A7B

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

Preview Lab → · Contrast checker → · Palette generator →