#171B71#171B71

#171B71 is a dark, vivid blue. Relative luminance 0.022; OKLCH L 29.1% C 0.143 H 271.3°. Best body text is #FFFFFF at 14.67:1 contrast (WCAG AA passes).

Color values

HEX	#171B71
RGB	rgb(23, 27, 113)
HSL	hsl(237, 66%, 27%)
HSV	hsv(237, 80%, 44%)
CMYK	cmyk(79.6%, 76.1%, 0%, 55.7%)
CIE-LAB	lab(16.30, 30.63, -49.51)
CIE-LCH	lch(16.30, 58.22, 301.75°)
OKLab	oklab(29.12% 0.0033 -0.1433)
OKLCH	oklch(29.12% 0.143 271.3)
XYZ	xyz(3.7249, 2.1579, 15.8398)
Luminance	0.0216 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B71 #716D17

analogous

#174871 #171B71 #401771

triadic

#171B71 #71171B #1B7117

tetradic

#171B71 #711748 #716D17 #177140

square

#171B71 #711748 #716D17 #177140

split-complementary

#171B71 #714017 #487117

monochromatic

#050619 #0D0F3E #171B71 #2127A4 #2E35D4

Accessibility & contrast

On white

14.67

#171B71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.43

#171B71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B71

14.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B71	#FFFFFF	#000000	##FFFFFF
##171B71	1.00	14.67	1.43	14.67
#FFFFFF	14.67	1.00	21.00	1.00
#000000	1.43	21.00	1.00	21.00
##FFFFFF	14.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002D74

Deuteranopia (green-blind)

#00246F

Tritanopia (blue-blind)

#003444

Achromatopsia (no color)

#282828

Design tokens & code

CSS

--color: #171b71;
/* rgb */ color: rgb(23, 27, 113);
/* oklch */ color: oklch(29.1% 0.143 271.3);

Tailwind

colors: {
  custom: {
    50: '#65589b',
    500: '#171b71',
    950: '#000000',
  },
}

SCSS

$custom: #171b71;
$custom-light: #65589b;
$custom-dark: #000000;

JSON

{
  "hex": "#171b71",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 113
  },
  "hsl": {
    "h": 237.333,
    "s": 66.176,
    "l": 26.667
  },
  "oklch": {
    "l": 0.29124,
    "c": 0.14336,
    "h": 271.3
  },
  "luminance": 0.02158
}

Semantic roles & 50–950 ramp

primary

#171B71

secondary

#A7A23D

accent

#E23FE9

background

#F6F5F9

surface

#EBE9F2

border

#C6C5CC

text

#07030E

muted

#7A787E

Preview Lab

Preview with #171B71

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

Preview Lab → · Contrast checker → · Palette generator →