#1F308F#1F308F

#1F308F is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.4% C 0.157 H 268.9°. Best body text is #FFFFFF at 11.18:1 contrast (WCAG AA passes).

Color values

HEX	#1F308F
RGB	rgb(31, 48, 143)
HSL	hsl(231, 64%, 34%)
HSV	hsv(231, 78%, 56%)
CMYK	cmyk(78.3%, 66.4%, 0%, 43.9%)
CIE-LAB	lab(24.91, 28.93, -54.30)
CIE-LCH	lch(24.91, 61.53, 298.05°)
OKLab	oklab(36.42% -0.003 -0.1571)
OKLCH	oklch(36.42% 0.157 268.9)
XYZ	xyz(6.5782, 4.3877, 26.4815)
Luminance	0.0439 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F308F #8F7E1F

analogous

#1F688F #1F308F #461F8F

triadic

#1F308F #8F1F30 #308F1F

tetradic

#1F308F #8F1F68 #8F7E1F #1F8F46

square

#1F308F #8F1F68 #8F7E1F #1F8F46

split-complementary

#1F308F #8F461F #688F1F

monochromatic

#090E2A #141F5D #1F308F #2A41C1 #4F64D9

Accessibility & contrast

On white

11.18

#1F308F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1F308F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F308F

11.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F308F	#FFFFFF	#000000	##FFFFFF
##1F308F	1.00	11.18	1.88	11.18
#FFFFFF	11.18	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004092

Deuteranopia (green-blind)

#00368D

Tritanopia (blue-blind)

#00495B

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1f308f;
/* rgb */ color: rgb(31, 48, 143);
/* oklch */ color: oklch(36.4% 0.157 268.9);

Tailwind

colors: {
  custom: {
    50: '#6e68b1',
    500: '#1f308f',
    950: '#000000',
  },
}

SCSS

$custom: #1f308f;
$custom-light: #6e68b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f308f",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 143
  },
  "hsl": {
    "h": 230.893,
    "s": 64.368,
    "l": 34.118
  },
  "oklch": {
    "l": 0.36415,
    "c": 0.15713,
    "h": 268.9
  },
  "luminance": 0.04388
}

Semantic roles & 50–950 ramp

primary

#1F308F

secondary

#BCAB4E

accent

#CE40E7

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080611

muted

#7B7A80

Preview Lab

Preview with #1F308F

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

Preview Lab → · Contrast checker → · Palette generator →