#171B81#171B81

#171B81 is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.0% C 0.164 H 270.2°. Best body text is #FFFFFF at 13.91:1 contrast (WCAG AA passes).

Color values

HEX	#171B81
RGB	rgb(23, 27, 129)
HSL	hsl(238, 70%, 30%)
HSV	hsv(238, 82%, 51%)
CMYK	cmyk(82.2%, 79.1%, 0%, 49.4%)
CIE-LAB	lab(18.15, 36.43, -56.70)
CIE-LCH	lch(18.15, 67.39, 302.72°)
OKLab	oklab(30.98% 0.0005 -0.1642)
OKLCH	oklch(30.98% 0.164 270.2)
XYZ	xyz(4.7064, 2.5505, 21.0089)
Luminance	0.0255 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B81 #817D17

analogous

#175081 #171B81 #481781

triadic

#171B81 #81171B #1B8117

tetradic

#171B81 #811750 #817D17 #178148

square

#171B81 #811750 #817D17 #178148

split-complementary

#171B81 #814817 #508117

monochromatic

#05051A #0E104D #171B81 #2026B5 #373DDB

Accessibility & contrast

On white

13.91

#171B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.51

#171B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B81

13.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B81	#FFFFFF	#000000	##FFFFFF
##171B81	1.00	13.91	1.51	13.91
#FFFFFF	13.91	1.00	21.00	1.00
#000000	1.51	21.00	1.00	21.00
##FFFFFF	13.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003284

Deuteranopia (green-blind)

#00277F

Tritanopia (blue-blind)

#003A4D

Achromatopsia (no color)

#2C2C2C

Design tokens & code

CSS

--color: #171b81;
/* rgb */ color: rgb(23, 27, 129);
/* oklch */ color: oklch(31.0% 0.164 270.2);

Tailwind

colors: {
  custom: {
    50: '#6a59a7',
    500: '#171b81',
    950: '#000000',
  },
}

SCSS

$custom: #171b81;
$custom-light: #6a59a7;
$custom-dark: #000000;

JSON

{
  "hex": "#171b81",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 129
  },
  "hsl": {
    "h": 237.736,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.30984,
    "c": 0.16422,
    "h": 270.2
  },
  "luminance": 0.02551
}

Semantic roles & 50–950 ramp

primary

#171B81

secondary

#B5B13E

accent

#E63BED

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#080310

muted

#7A787F

Preview Lab

Preview with #171B81

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

Preview Lab → · Contrast checker → · Palette generator →