#173D81#173D81

#173D81 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.5% C 0.123 H 261.0°. Best body text is #FFFFFF at 10.39:1 contrast (WCAG AA passes).

Color values

HEX	#173D81
RGB	rgb(23, 61, 129)
HSL	hsl(218, 70%, 30%)
HSV	hsv(218, 82%, 51%)
CMYK	cmyk(82.2%, 52.7%, 0%, 49.4%)
CIE-LAB	lab(27.03, 13.43, -42.16)
CIE-LCH	lch(27.03, 44.24, 287.67°)
OKLab	oklab(37.54% -0.0193 -0.1214)
OKLCH	oklch(37.54% 0.123 261)
XYZ	xyz(5.9831, 5.1039, 21.4344)
Luminance	0.0510 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D81 #815B17

analogous

#177281 #173D81 #261781

triadic

#173D81 #81173D #3D8117

tetradic

#173D81 #811772 #815B17 #178126

square

#173D81 #811772 #815B17 #178126

split-complementary

#173D81 #812617 #728117

monochromatic

#050C1A #0E244D #173D81 #2056B5 #3772DB

Accessibility & contrast

On white

10.39

#173D81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#173D81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D81

10.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D81	#FFFFFF	#000000	##FFFFFF
##173D81	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)

#114583

Deuteranopia (green-blind)

#003B80

Tritanopia (blue-blind)

#004D59

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173d81;
/* rgb */ color: rgb(23, 61, 129);
/* oklch */ color: oklch(37.5% 0.123 261.0);

Tailwind

colors: {
  custom: {
    50: '#6771a6',
    500: '#173d81',
    950: '#000000',
  },
}

SCSS

$custom: #173d81;
$custom-light: #6771a6;
$custom-dark: #000000;

JSON

{
  "hex": "#173d81",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 129
  },
  "hsl": {
    "h": 218.491,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.37542,
    "c": 0.12291,
    "h": 261
  },
  "luminance": 0.05105
}

Semantic roles & 50–950 ramp

primary

#173D81

secondary

#B58B3E

accent

#AD3BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173D81

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

Preview Lab → · Contrast checker → · Palette generator →