#1F308C#1F308C

#1F308C is a dark, vivid blue. Relative luminance 0.043; OKLCH L 36.1% C 0.153 H 268.9°. Best body text is #FFFFFF at 11.29:1 contrast (WCAG AA passes).

Color values

HEX	#1F308C
RGB	rgb(31, 48, 140)
HSL	hsl(231, 64%, 34%)
HSV	hsv(231, 78%, 55%)
CMYK	cmyk(77.9%, 65.7%, 0%, 45.1%)
CIE-LAB	lab(24.63, 27.78, -52.90)
CIE-LCH	lch(24.63, 59.75, 297.71°)
OKLab	oklab(36.12% -0.0028 -0.153)
OKLCH	oklch(36.12% 0.153 268.9)
XYZ	xyz(6.3540, 4.2980, 25.3006)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F308C #8C7B1F

analogous

#1F668C #1F308C #441F8C

triadic

#1F308C #8C1F30 #308C1F

tetradic

#1F308C #8C1F66 #8C7B1F #1F8C44

square

#1F308C #8C1F66 #8C7B1F #1F8C44

split-complementary

#1F308C #8C441F #668C1F

monochromatic

#090E28 #141F5A #1F308C #2A41BE #4E63D8

Accessibility & contrast

On white

11.29

#1F308C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#1F308C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F308C

11.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F308C	#FFFFFF	#000000	##FFFFFF
##1F308C	1.00	11.29	1.86	11.29
#FFFFFF	11.29	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00408F

Deuteranopia (green-blind)

#00358A

Tritanopia (blue-blind)

#004859

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f308c;
/* rgb */ color: rgb(31, 48, 140);
/* oklch */ color: oklch(36.1% 0.153 268.9);

Tailwind

colors: {
  custom: {
    50: '#6d68ae',
    500: '#1f308c',
    950: '#000000',
  },
}

SCSS

$custom: #1f308c;
$custom-light: #6d68ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f308c",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 140
  },
  "hsl": {
    "h": 230.642,
    "s": 63.743,
    "l": 33.529
  },
  "oklch": {
    "l": 0.36123,
    "c": 0.15303,
    "h": 268.9
  },
  "luminance": 0.04299
}

Semantic roles & 50–950 ramp

primary

#1F308C

secondary

#BBA94C

accent

#CD41E7

background

#F7F6FA

surface

#EDEBF5

border

#C8C6CF

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F308C

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

Preview Lab → · Contrast checker → · Palette generator →