#172B81#172B81

#172B81 is a dark, vivid blue. Relative luminance 0.035; OKLCH L 33.7% C 0.146 H 267.3°. Best body text is #FFFFFF at 12.36:1 contrast (WCAG AA passes).

Color values

HEX	#172B81
RGB	rgb(23, 43, 129)
HSL	hsl(229, 70%, 30%)
HSV	hsv(229, 82%, 51%)
CMYK	cmyk(82.2%, 66.7%, 0%, 49.4%)
CIE-LAB	lab(21.92, 26.08, -50.47)
CIE-LCH	lch(21.92, 56.81, 297.33°)
OKLab	oklab(33.71% -0.0068 -0.1461)
OKLCH	oklch(33.71% 0.146 267.3)
XYZ	xyz(5.1783, 3.4943, 21.1662)
Luminance	0.0350 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#172B81 #816D17

analogous

#176081 #172B81 #381781

triadic

#172B81 #81172B #2B8117

tetradic

#172B81 #811760 #816D17 #178138

square

#172B81 #811760 #816D17 #178138

split-complementary

#172B81 #813817 #608117

monochromatic

#05091A #0E1A4D #172B81 #203CB5 #3756DB

Accessibility & contrast

On white

12.36

#172B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.70

#172B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #172B81

12.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##172B81	#FFFFFF	#000000	##FFFFFF
##172B81	1.00	12.36	1.70	12.36
#FFFFFF	12.36	1.00	21.00	1.00
#000000	1.70	21.00	1.00	21.00
##FFFFFF	12.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003A84

Deuteranopia (green-blind)

#00307F

Tritanopia (blue-blind)

#004252

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #172b81;
/* rgb */ color: rgb(23, 43, 129);
/* oklch */ color: oklch(33.7% 0.146 267.3);

Tailwind

colors: {
  custom: {
    50: '#6864a6',
    500: '#172b81',
    950: '#000000',
  },
}

SCSS

$custom: #172b81;
$custom-light: #6864a6;
$custom-dark: #000000;

JSON

{
  "hex": "#172b81",
  "rgb": {
    "r": 23,
    "g": 43,
    "b": 129
  },
  "hsl": {
    "h": 228.679,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.3371,
    "c": 0.14626,
    "h": 267.3
  },
  "luminance": 0.03495
}

Semantic roles & 50–950 ramp

primary

#172B81

secondary

#B59F3E

accent

#CB3BED

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #172B81

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

Preview Lab → · Contrast checker → · Palette generator →