#171F71#171F71

#171F71 is a dark, vivid blue. Relative luminance 0.024; OKLCH L 29.8% C 0.139 H 270.5°. Best body text is #FFFFFF at 14.28:1 contrast (WCAG AA passes).

Color values

HEX	#171F71
RGB	rgb(23, 31, 113)
HSL	hsl(235, 66%, 27%)
HSV	hsv(235, 80%, 44%)
CMYK	cmyk(79.6%, 72.6%, 0%, 55.7%)
CIE-LAB	lab(17.25, 28.02, -47.94)
CIE-LCH	lch(17.25, 55.53, 300.30°)
OKLab	oklab(29.81% 0.0012 -0.1388)
OKLCH	oklch(29.81% 0.139 270.5)
XYZ	xyz(3.8230, 2.3540, 15.8725)
Luminance	0.0235 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171F71 #716917

analogous

#174C71 #171F71 #3C1771

triadic

#171F71 #71171F #1F7117

tetradic

#171F71 #71174C #716917 #17713C

square

#171F71 #71174C #716917 #17713C

split-complementary

#171F71 #713C17 #4C7117

monochromatic

#050719 #0D113E #171F71 #212DA4 #2E3DD4

Accessibility & contrast

On white

14.28

#171F71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.47

#171F71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171F71

14.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171F71	#FFFFFF	#000000	##FFFFFF
##171F71	1.00	14.28	1.47	14.28
#FFFFFF	14.28	1.00	21.00	1.00
#000000	1.47	21.00	1.00	21.00
##FFFFFF	14.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002F73

Deuteranopia (green-blind)

#00266F

Tritanopia (blue-blind)

#003645

Achromatopsia (no color)

#2A2A2A

Design tokens & code

CSS

--color: #171f71;
/* rgb */ color: rgb(23, 31, 113);
/* oklch */ color: oklch(29.8% 0.139 270.5);

Tailwind

colors: {
  custom: {
    50: '#655b9b',
    500: '#171f71',
    950: '#000000',
  },
}

SCSS

$custom: #171f71;
$custom-light: #655b9b;
$custom-dark: #000000;

JSON

{
  "hex": "#171f71",
  "rgb": {
    "r": 23,
    "g": 31,
    "b": 113
  },
  "hsl": {
    "h": 234.667,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.29806,
    "c": 0.13877,
    "h": 270.5
  },
  "luminance": 0.02354
}

Semantic roles & 50–950 ramp

primary

#171F71

secondary

#A79D3D

accent

#DA3FE9

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#06040E

muted

#7A797E

Preview Lab

Preview with #171F71

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

Preview Lab → · Contrast checker → · Palette generator →