#171F3F#171F3F

#171F3F is a dark, moderate blue. Relative luminance 0.015; OKLCH L 25.1% C 0.061 H 270.8°. Best body text is #FFFFFF at 16.10:1 contrast (WCAG AA passes).

Color values

HEX	#171F3F
RGB	rgb(23, 31, 63)
HSL	hsl(228, 47%, 17%)
HSV	hsv(228, 63%, 25%)
CMYK	cmyk(63.5%, 50.8%, 0%, 75.3%)
CIE-LAB	lab(12.74, 7.90, -21.60)
CIE-LCH	lch(12.74, 23.00, 290.09°)
OKLab	oklab(25.07% 0.0009 -0.0615)
OKLCH	oklch(25.07% 0.062 270.8)
XYZ	xyz(1.7402, 1.5209, 4.9035)
Luminance	0.0152 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171F3F #3F3717

analogous

#17333F #171F3F #23173F

triadic

#171F3F #3F171F #1F3F17

tetradic

#171F3F #3F1733 #3F3717 #173F23

square

#171F3F #3F1733 #3F3717 #173F23

split-complementary

#171F3F #3F2317 #333F17

monochromatic

#080B16 #080B16 #171F3F #27356C #384B99

Accessibility & contrast

On white

16.10

#171F3F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.30

#171F3F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171F3F

16.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171F3F	#FFFFFF	#000000	##FFFFFF
##171F3F	1.00	16.10	1.30	16.10
#FFFFFF	16.10	1.00	21.00	1.00
#000000	1.30	21.00	1.00	21.00
##FFFFFF	16.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#112340

Deuteranopia (green-blind)

#0C1F3E

Tritanopia (blue-blind)

#03262B

Achromatopsia (no color)

#212121

Design tokens & code

CSS

--color: #171f3f;
/* rgb */ color: rgb(23, 31, 63);
/* oklch */ color: oklch(25.1% 0.061 270.8);

Tailwind

colors: {
  custom: {
    50: '#585a74',
    500: '#171f3f',
    950: '#000000',
  },
}

SCSS

$custom: #171f3f;
$custom-light: #585a74;
$custom-dark: #000000;

JSON

{
  "hex": "#171f3f",
  "rgb": {
    "r": 23,
    "g": 31,
    "b": 63
  },
  "hsl": {
    "h": 228,
    "s": 46.512,
    "l": 16.863
  },
  "oklch": {
    "l": 0.25065,
    "c": 0.0615,
    "h": 270.8
  },
  "luminance": 0.01521
}

Semantic roles & 50–950 ramp

primary

#171F3F

secondary

#766A3C

accent

#BC52D6

background

#F5F5F7

surface

#E9E9ED

border

#C5C5C8

text

#030308

muted

#78787B

Preview Lab

Preview with #171F3F

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

Preview Lab → · Contrast checker → · Palette generator →