#173A8C#173A8C

#173A8C is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.8% C 0.143 H 263.6°. Best body text is #FFFFFF at 10.39:1 contrast (WCAG AA passes).

Color values

HEX	#173A8C
RGB	rgb(23, 58, 140)
HSL	hsl(222, 72%, 32%)
HSV	hsv(222, 84%, 55%)
CMYK	cmyk(83.6%, 58.6%, 0%, 45.1%)
CIE-LAB	lab(27.02, 20.06, -49.01)
CIE-LCH	lch(27.02, 52.96, 292.26°)
OKLab	oklab(37.81% -0.016 -0.1416)
OKLCH	oklch(37.81% 0.143 263.6)
XYZ	xyz(6.5983, 5.1009, 25.4427)
Luminance	0.0510 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A8C #8C6917

analogous

#17758C #173A8C #2E178C

triadic

#173A8C #8C173A #3A8C17

tetradic

#173A8C #8C1775 #8C6917 #178C2E

square

#173A8C #8C1775 #8C6917 #178C2E

split-complementary

#173A8C #8C2E17 #758C17

monochromatic

#060E23 #0E2457 #173A8C #2050C1 #3E6EDF

Accessibility & contrast

On white

10.39

#173A8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#173A8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A8C

10.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A8C	#FFFFFF	#000000	##FFFFFF
##173A8C	1.00	10.39	2.02	10.39
#FFFFFF	10.39	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458F

Deuteranopia (green-blind)

#003B8A

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173a8c;
/* rgb */ color: rgb(23, 58, 140);
/* oklch */ color: oklch(37.8% 0.143 263.6);

Tailwind

colors: {
  custom: {
    50: '#6a6fae',
    500: '#173a8c',
    950: '#000000',
  },
}

SCSS

$custom: #173a8c;
$custom-light: #6a6fae;
$custom-dark: #000000;

JSON

{
  "hex": "#173a8c",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 140
  },
  "hsl": {
    "h": 222.051,
    "s": 71.779,
    "l": 31.961
  },
  "oklch": {
    "l": 0.37809,
    "c": 0.14251,
    "h": 263.6
  },
  "luminance": 0.05102
}

Semantic roles & 50–950 ramp

primary

#173A8C

secondary

#BF993F

accent

#B839EF

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #173A8C

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

Preview Lab → · Contrast checker → · Palette generator →