#171B53#171B53

#171B53 is a dark, moderate blue. Relative luminance 0.016; OKLCH L 25.9% C 0.100 H 273.9°. Best body text is #FFFFFF at 15.93:1 contrast (WCAG AA passes).

Color values

HEX	#171B53
RGB	rgb(23, 27, 83)
HSL	hsl(236, 57%, 21%)
HSV	hsv(236, 72%, 33%)
CMYK	cmyk(72.3%, 67.5%, 0%, 67.5%)
CIE-LAB	lab(13.17, 19.01, -34.73)
CIE-LCH	lch(13.17, 39.60, 298.69°)
OKLab	oklab(25.91% 0.0068 -0.1001)
OKLCH	oklch(25.91% 0.1 273.9)
XYZ	xyz(2.3061, 1.5904, 8.3674)
Luminance	0.0159 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B53 #534F17

analogous

#173953 #171B53 #311753

triadic

#171B53 #53171B #1B5317

tetradic

#171B53 #531739 #534F17 #175331

square

#171B53 #531739 #534F17 #175331

split-complementary

#171B53 #533117 #395317

monochromatic

#070818 #0A0B23 #171B53 #242B83 #323AB3

Accessibility & contrast

On white

15.93

#171B53 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.32

#171B53 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B53

15.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B53	#FFFFFF	#000000	##FFFFFF
##171B53	1.00	15.93	1.32	15.93
#FFFFFF	15.93	1.00	21.00	1.00
#000000	1.32	21.00	1.00	21.00
##FFFFFF	15.93	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002555

Deuteranopia (green-blind)

#001F52

Tritanopia (blue-blind)

#002934

Achromatopsia (no color)

#222222

Design tokens & code

CSS

--color: #171b53;
/* rgb */ color: rgb(23, 27, 83);
/* oklch */ color: oklch(25.9% 0.100 273.9);

Tailwind

colors: {
  custom: {
    50: '#5d5784',
    500: '#171b53',
    950: '#000000',
  },
}

SCSS

$custom: #171b53;
$custom-light: #5d5784;
$custom-dark: #000000;

JSON

{
  "hex": "#171b53",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 83
  },
  "hsl": {
    "h": 236,
    "s": 56.604,
    "l": 20.784
  },
  "oklch": {
    "l": 0.25912,
    "c": 0.10037,
    "h": 273.9
  },
  "luminance": 0.01591
}

Semantic roles & 50–950 ramp

primary

#171B53

secondary

#8A853C

accent

#D648E0

background

#F5F5F8

surface

#E9E9EF

border

#C5C5CA

text

#05030B

muted

#79787C

Preview Lab

Preview with #171B53

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

Preview Lab → · Contrast checker → · Palette generator →