#1F177B#1F177B

#1F177B is a dark, vivid blue. Relative luminance 0.023; OKLCH L 30.2% C 0.158 H 274.9°. Best body text is #FFFFFF at 14.32:1 contrast (WCAG AA passes).

Color values

HEX	#1F177B
RGB	rgb(31, 23, 123)
HSL	hsl(245, 68%, 29%)
HSV	hsv(245, 81%, 48%)
CMYK	cmyk(74.8%, 81.3%, 0%, 51.8%)
CIE-LAB	lab(17.15, 37.26, -54.51)
CIE-LCH	lch(17.15, 66.03, 304.36°)
OKLab	oklab(30.21% 0.0134 -0.1577)
OKLCH	oklch(30.21% 0.158 274.9)
XYZ	xyz(4.4454, 2.3337, 18.9512)
Luminance	0.0233 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F177B #737B17

analogous

#17417B #1F177B #51177B

triadic

#1F177B #7B1F17 #177B1F

tetradic

#1F177B #7B1741 #737B17 #177B51

square

#1F177B #7B1741 #737B17 #177B51

split-complementary

#1F177B #7B5117 #417B17

monochromatic

#06051A #120D47 #1F177B #2C21AF #4133D9

Accessibility & contrast

On white

14.32

#1F177B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.47

#1F177B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F177B

14.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F177B	#FFFFFF	#000000	##FFFFFF
##1F177B	1.00	14.32	1.47	14.32
#FFFFFF	14.32	1.00	21.00	1.00
#000000	1.47	21.00	1.00	21.00
##FFFFFF	14.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002F7E

Deuteranopia (green-blind)

#002679

Tritanopia (blue-blind)

#003549

Achromatopsia (no color)

#2A2A2A

Design tokens & code

CSS

--color: #1f177b;
/* rgb */ color: rgb(31, 23, 123);
/* oklch */ color: oklch(30.2% 0.158 274.9);

Tailwind

colors: {
  custom: {
    50: '#6b57a2',
    500: '#1f177b',
    950: '#000000',
  },
}

SCSS

$custom: #1f177b;
$custom-light: #6b57a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f177b",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 123
  },
  "hsl": {
    "h": 244.8,
    "s": 68.493,
    "l": 28.627
  },
  "oklch": {
    "l": 0.3021,
    "c": 0.15822,
    "h": 274.9
  },
  "luminance": 0.02334
}

Semantic roles & 50–950 ramp

primary

#1F177B

secondary

#A7B03E

accent

#EB3CDD

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#08030F

muted

#7B787F

Preview Lab

Preview with #1F177B

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

Preview Lab → · Contrast checker → · Palette generator →