#170F4B#170F4B

#170F4B is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 22.8% C 0.105 H 280.2°. Best body text is #FFFFFF at 17.41:1 contrast (WCAG AA passes).

Color values

HEX	#170F4B
RGB	rgb(23, 15, 75)
HSL	hsl(248, 67%, 18%)
HSV	hsv(248, 80%, 29%)
CMYK	cmyk(69.3%, 80%, 0%, 70.6%)
CIE-LAB	lab(9.25, 24.27, -35.65)
CIE-LCH	lch(9.25, 43.13, 304.25°)
OKLab	oklab(22.82% 0.0185 -0.1029)
OKLCH	oklch(22.82% 0.105 280.2)
XYZ	xyz(1.7938, 1.0317, 6.7599)
Luminance	0.0103 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#170F4B #434B0F

analogous

#0F254B #170F4B #350F4B

triadic

#170F4B #4B170F #0F4B17

tetradic

#170F4B #4B0F25 #434B0F #0F4B35

square

#170F4B #4B0F25 #434B0F #0F4B35

split-complementary

#170F4B #4B350F #254B0F

monochromatic

#08051A #08051A #170F4B #27197E #3623B1

Accessibility & contrast

On white

17.41

#170F4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.21

#170F4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #170F4B

17.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##170F4B	#FFFFFF	#000000	##FFFFFF
##170F4B	1.00	17.41	1.21	17.41
#FFFFFF	17.41	1.00	21.00	1.00
#000000	1.21	21.00	1.00	21.00
##FFFFFF	17.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001C4D

Deuteranopia (green-blind)

#00184A

Tritanopia (blue-blind)

#00202C

Achromatopsia (no color)

#1A1A1A

Design tokens & code

CSS

--color: #170f4b;
/* rgb */ color: rgb(23, 15, 75);
/* oklch */ color: oklch(22.8% 0.105 280.2);

Tailwind

colors: {
  custom: {
    50: '#5c4e7e',
    500: '#170f4b',
    950: '#000000',
  },
}

SCSS

$custom: #170f4b;
$custom-light: #5c4e7e;
$custom-dark: #000000;

JSON

{
  "hex": "#170f4b",
  "rgb": {
    "r": 23,
    "g": 15,
    "b": 75
  },
  "hsl": {
    "h": 248,
    "s": 66.667,
    "l": 17.647
  },
  "oklch": {
    "l": 0.22823,
    "c": 0.10451,
    "h": 280.2
  },
  "luminance": 0.01032
}

Semantic roles & 50–950 ramp

primary

#170F4B

secondary

#7A8530

accent

#EA3ED3

background

#F5F4F7

surface

#E9E7EE

border

#C5C3C9

text

#04010A

muted

#79777C

Preview Lab

Preview with #170F4B

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

Preview Lab → · Contrast checker → · Palette generator →