#171B73#171B73

#171B73 is a dark, vivid blue. Relative luminance 0.022; OKLCH L 29.4% C 0.146 H 271.2°. Best body text is #FFFFFF at 14.58:1 contrast (WCAG AA passes).

Color values

HEX	#171B73
RGB	rgb(23, 27, 115)
HSL	hsl(237, 67%, 27%)
HSV	hsv(237, 80%, 45%)
CMYK	cmyk(80%, 76.5%, 0%, 54.9%)
CIE-LAB	lab(16.52, 31.37, -50.43)
CIE-LCH	lch(16.52, 59.39, 301.89°)
OKLab	oklab(29.35% 0.003 -0.146)
OKLCH	oklch(29.35% 0.146 271.2)
XYZ	xyz(3.8387, 2.2034, 16.4393)
Luminance	0.0220 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B73 #736F17

analogous

#174973 #171B73 #411773

triadic

#171B73 #73171B #1B7317

tetradic

#171B73 #731749 #736F17 #177341

square

#171B73 #731749 #736F17 #177341

split-complementary

#171B73 #734117 #497317

monochromatic

#05061A #0D0F40 #171B73 #2127A6 #2F36D5

Accessibility & contrast

On white

14.58

#171B73 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.44

#171B73 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B73

14.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B73	#FFFFFF	#000000	##FFFFFF
##171B73	1.00	14.58	1.44	14.58
#FFFFFF	14.58	1.00	21.00	1.00
#000000	1.44	21.00	1.00	21.00
##FFFFFF	14.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002D76

Deuteranopia (green-blind)

#002471

Tritanopia (blue-blind)

#003445

Achromatopsia (no color)

#292929

Design tokens & code

CSS

--color: #171b73;
/* rgb */ color: rgb(23, 27, 115);
/* oklch */ color: oklch(29.4% 0.146 271.2);

Tailwind

colors: {
  custom: {
    50: '#66589c',
    500: '#171b73',
    950: '#000000',
  },
}

SCSS

$custom: #171b73;
$custom-light: #66589c;
$custom-dark: #000000;

JSON

{
  "hex": "#171b73",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 115
  },
  "hsl": {
    "h": 237.391,
    "s": 66.667,
    "l": 27.059
  },
  "oklch": {
    "l": 0.29352,
    "c": 0.14603,
    "h": 271.2
  },
  "luminance": 0.02204
}

Semantic roles & 50–950 ramp

primary

#171B73

secondary

#A9A43D

accent

#E23EEA

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07030E

muted

#7A787E

Preview Lab

Preview with #171B73

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

Preview Lab → · Contrast checker → · Palette generator →