#173B71#173B71

#173B71 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.8% C 0.102 H 258.6°. Best body text is #FFFFFF at 11.05:1 contrast (WCAG AA passes).

Color values

HEX	#173B71
RGB	rgb(23, 59, 113)
HSL	hsl(216, 66%, 27%)
HSV	hsv(216, 80%, 44%)
CMYK	cmyk(79.6%, 47.8%, 0%, 55.7%)
CIE-LAB	lab(25.27, 8.18, -34.90)
CIE-LCH	lch(25.27, 35.84, 283.20°)
OKLab	oklab(35.82% -0.0202 -0.1001)
OKLCH	oklch(35.82% 0.102 258.6)
XYZ	xyz(4.8969, 4.5018, 16.2304)
Luminance	0.0450 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B71 #714D17

analogous

#176871 #173B71 #201771

triadic

#173B71 #71173B #3B7117

tetradic

#173B71 #711768 #714D17 #177120

square

#173B71 #711768 #714D17 #177120

split-complementary

#173B71 #712017 #687117

monochromatic

#050D19 #0D203E #173B71 #2156A4 #2E71D4

Accessibility & contrast

On white

11.05

#173B71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#173B71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B71

11.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B71	#FFFFFF	#000000	##FFFFFF
##173B71	1.00	11.05	1.90	11.05
#FFFFFF	11.05	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F4073

Deuteranopia (green-blind)

#0A3870

Tritanopia (blue-blind)

#004850

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173b71;
/* rgb */ color: rgb(23, 59, 113);
/* oklch */ color: oklch(35.8% 0.102 258.6);

Tailwind

colors: {
  custom: {
    50: '#63709a',
    500: '#173b71',
    950: '#000000',
  },
}

SCSS

$custom: #173b71;
$custom-light: #63709a;
$custom-dark: #000000;

JSON

{
  "hex": "#173b71",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 113
  },
  "hsl": {
    "h": 216,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.35821,
    "c": 0.10209,
    "h": 258.6
  },
  "luminance": 0.04502
}

Semantic roles & 50–950 ramp

primary

#173B71

secondary

#A77C3D

accent

#A53FE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173B71

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

Preview Lab → · Contrast checker → · Palette generator →