#171B5A#171B5A

#171B5A is a dark, moderate blue. Relative luminance 0.017; OKLCH L 26.6% C 0.111 H 273.3°. Best body text is #FFFFFF at 15.66:1 contrast (WCAG AA passes).

Color values

HEX	#171B5A
RGB	rgb(23, 27, 90)
HSL	hsl(236, 59%, 22%)
HSV	hsv(236, 74%, 35%)
CMYK	cmyk(74.4%, 70%, 0%, 64.7%)
CIE-LAB	lab(13.85, 21.80, -38.36)
CIE-LCH	lch(13.85, 44.12, 299.61°)
OKLab	oklab(26.62% 0.0063 -0.1108)
OKLCH	oklch(26.62% 0.111 273.3)
XYZ	xyz(2.5901, 1.7040, 9.8633)
Luminance	0.0170 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B5A #5A5617

analogous

#173D5A #171B5A #35175A

triadic

#171B5A #5A171B #1B5A17

tetradic

#171B5A #5A173D #5A5617 #175A35

square

#171B5A #5A173D #5A5617 #175A35

split-complementary

#171B5A #5A3517 #3D5A17

monochromatic

#060718 #0B0C29 #171B5A #232A8B #3038BB

Accessibility & contrast

On white

15.66

#171B5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.34

#171B5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B5A

15.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B5A	#FFFFFF	#000000	##FFFFFF
##171B5A	1.00	15.66	1.34	15.66
#FFFFFF	15.66	1.00	21.00	1.00
#000000	1.34	21.00	1.00	21.00
##FFFFFF	15.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00265C

Deuteranopia (green-blind)

#002059

Tritanopia (blue-blind)

#002B37

Achromatopsia (no color)

#232323

Design tokens & code

CSS

--color: #171b5a;
/* rgb */ color: rgb(23, 27, 90);
/* oklch */ color: oklch(26.6% 0.111 273.3);

Tailwind

colors: {
  custom: {
    50: '#5f5789',
    500: '#171b5a',
    950: '#000000',
  },
}

SCSS

$custom: #171b5a;
$custom-light: #5f5789;
$custom-dark: #000000;

JSON

{
  "hex": "#171b5a",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 90
  },
  "hsl": {
    "h": 236.418,
    "s": 59.292,
    "l": 22.157
  },
  "oklch": {
    "l": 0.26619,
    "c": 0.11094,
    "h": 273.3
  },
  "luminance": 0.01704
}

Semantic roles & 50–950 ramp

primary

#171B5A

secondary

#918C3C

accent

#D945E2

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030C

muted

#79787D

Preview Lab

Preview with #171B5A

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

Preview Lab → · Contrast checker → · Palette generator →