#172B80#172B80

#172B80 is a dark, vivid blue. Relative luminance 0.035; OKLCH L 33.6% C 0.145 H 267.3°. Best body text is #FFFFFF at 12.40:1 contrast (WCAG AA passes).

Color values

HEX	#172B80
RGB	rgb(23, 43, 128)
HSL	hsl(229, 70%, 30%)
HSV	hsv(229, 82%, 50%)
CMYK	cmyk(82%, 66.4%, 0%, 49.8%)
CIE-LAB	lab(21.83, 25.69, -50.00)
CIE-LCH	lch(21.83, 56.21, 297.19°)
OKLab	oklab(33.61% -0.0068 -0.1447)
OKLCH	oklch(33.61% 0.145 267.3)
XYZ	xyz(5.1121, 3.4678, 20.8178)
Luminance	0.0347 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#172B80 #806C17

analogous

#176080 #172B80 #371780

triadic

#172B80 #80172B #2B8017

tetradic

#172B80 #801760 #806C17 #178037

square

#172B80 #801760 #806C17 #178037

split-complementary

#172B80 #803717 #608017

monochromatic

#05091A #0E1A4C #172B80 #203CB4 #3656DB

Accessibility & contrast

On white

12.40

#172B80 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.69

#172B80 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #172B80

12.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##172B80	#FFFFFF	#000000	##FFFFFF
##172B80	1.00	12.40	1.69	12.40
#FFFFFF	12.40	1.00	21.00	1.00
#000000	1.69	21.00	1.00	21.00
##FFFFFF	12.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003983

Deuteranopia (green-blind)

#002F7E

Tritanopia (blue-blind)

#004251

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #172b80;
/* rgb */ color: rgb(23, 43, 128);
/* oklch */ color: oklch(33.6% 0.145 267.3);

Tailwind

colors: {
  custom: {
    50: '#6864a6',
    500: '#172b80',
    950: '#000000',
  },
}

SCSS

$custom: #172b80;
$custom-light: #6864a6;
$custom-dark: #000000;

JSON

{
  "hex": "#172b80",
  "rgb": {
    "r": 23,
    "g": 43,
    "b": 128
  },
  "hsl": {
    "h": 228.571,
    "s": 69.536,
    "l": 29.608
  },
  "oklch": {
    "l": 0.3361,
    "c": 0.14487,
    "h": 267.3
  },
  "luminance": 0.03468
}

Semantic roles & 50–950 ramp

primary

#172B80

secondary

#B49E3E

accent

#CB3BEC

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #172B80

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

Preview Lab → · Contrast checker → · Palette generator →