#173A7D#173A7D

#173A7D is a dark, vivid blue. Relative luminance 0.047; OKLCH L 36.5% C 0.121 H 261.7°. Best body text is #FFFFFF at 10.84:1 contrast (WCAG AA passes).

Color values

HEX	#173A7D
RGB	rgb(23, 58, 125)
HSL	hsl(219, 69%, 29%)
HSV	hsv(219, 82%, 49%)
CMYK	cmyk(81.6%, 53.6%, 0%, 51%)
CIE-LAB	lab(25.83, 13.88, -41.59)
CIE-LCH	lch(25.83, 43.85, 288.46°)
OKLab	oklab(36.53% -0.0174 -0.1198)
OKLCH	oklch(36.53% 0.121 261.7)
XYZ	xyz(5.5667, 4.6883, 20.0096)
Luminance	0.0469 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A7D #7D5A17

analogous

#176D7D #173A7D #27177D

triadic

#173A7D #7D173A #3A7D17

tetradic

#173A7D #7D176D #7D5A17 #177D27

square

#173A7D #7D176D #7D5A17 #177D27

split-complementary

#173A7D #7D2717 #6D7D17

monochromatic

#050C1A #0D2249 #173A7D #2152B1 #356DDA

Accessibility & contrast

On white

10.84

#173A7D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#173A7D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A7D

10.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A7D	#FFFFFF	#000000	##FFFFFF
##173A7D	1.00	10.84	1.94	10.84
#FFFFFF	10.84	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C427F

Deuteranopia (green-blind)

#00397C

Tritanopia (blue-blind)

#004A55

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173a7d;
/* rgb */ color: rgb(23, 58, 125);
/* oklch */ color: oklch(36.5% 0.121 261.7);

Tailwind

colors: {
  custom: {
    50: '#666fa3',
    500: '#173a7d',
    950: '#000000',
  },
}

SCSS

$custom: #173a7d;
$custom-light: #666fa3;
$custom-dark: #000000;

JSON

{
  "hex": "#173a7d",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 125
  },
  "hsl": {
    "h": 219.412,
    "s": 68.919,
    "l": 29.02
  },
  "oklch": {
    "l": 0.36529,
    "c": 0.12105,
    "h": 261.7
  },
  "luminance": 0.04689
}

Semantic roles & 50–950 ramp

primary

#173A7D

secondary

#B28A3E

accent

#AF3CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173A7D

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

Preview Lab → · Contrast checker → · Palette generator →