#171F58#171F58

#171F58 is a dark, moderate blue. Relative luminance 0.019; OKLCH L 27.2% C 0.102 H 271.7°. Best body text is #FFFFFF at 15.29:1 contrast (WCAG AA passes).

Color values

HEX	#171F58
RGB	rgb(23, 31, 88)
HSL	hsl(233, 59%, 22%)
HSV	hsv(233, 74%, 35%)
CMYK	cmyk(73.9%, 64.8%, 0%, 65.5%)
CIE-LAB	lab(14.77, 18.10, -35.51)
CIE-LCH	lch(14.77, 39.86, 297.01°)
OKLab	oklab(27.24% 0.003 -0.1024)
OKLCH	oklch(27.24% 0.102 271.7)
XYZ	xyz(2.6042, 1.8665, 9.4536)
Luminance	0.0187 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171F58 #585017

analogous

#174058 #171F58 #301758

triadic

#171F58 #58171F #1F5817

tetradic

#171F58 #581740 #585017 #175830

square

#171F58 #581740 #585017 #175830

split-complementary

#171F58 #583017 #405817

monochromatic

#060918 #0A0E27 #171F58 #243089 #3041B9

Accessibility & contrast

On white

15.29

#171F58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.37

#171F58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171F58

15.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171F58	#FFFFFF	#000000	##FFFFFF
##171F58	1.00	15.29	1.37	15.29
#FFFFFF	15.29	1.00	21.00	1.00
#000000	1.37	21.00	1.00	21.00
##FFFFFF	15.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00285A

Deuteranopia (green-blind)

#002257

Tritanopia (blue-blind)

#002D38

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #171f58;
/* rgb */ color: rgb(23, 31, 88);
/* oklch */ color: oklch(27.2% 0.102 271.7);

Tailwind

colors: {
  custom: {
    50: '#5e5a88',
    500: '#171f58',
    950: '#000000',
  },
}

SCSS

$custom: #171f58;
$custom-light: #5e5a88;
$custom-dark: #000000;

JSON

{
  "hex": "#171f58",
  "rgb": {
    "r": 23,
    "g": 31,
    "b": 88
  },
  "hsl": {
    "h": 232.615,
    "s": 58.559,
    "l": 21.765
  },
  "oklch": {
    "l": 0.27237,
    "c": 0.10241,
    "h": 271.7
  },
  "luminance": 0.01867
}

Semantic roles & 50–950 ramp

primary

#171F58

secondary

#8F853C

accent

#CF46E2

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05030B

muted

#79787C

Preview Lab

Preview with #171F58

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

Preview Lab → · Contrast checker → · Palette generator →