#1F309E#1F309E

#1F309E is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.9% C 0.177 H 268.7°. Best body text is #FFFFFF at 10.63:1 contrast (WCAG AA passes).

Color values

HEX	#1F309E
RGB	rgb(31, 48, 158)
HSL	hsl(232, 67%, 37%)
HSV	hsv(232, 80%, 62%)
CMYK	cmyk(80.4%, 69.6%, 0%, 38%)
CIE-LAB	lab(26.37, 34.57, -61.12)
CIE-LCH	lch(26.37, 70.22, 299.50°)
OKLab	oklab(37.92% -0.0041 -0.177)
OKLCH	oklch(37.92% 0.177 268.7)
XYZ	xyz(7.7915, 4.8729, 32.8711)
Luminance	0.0487 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F309E #9E8D1F

analogous

#1F6F9E #1F309E #4E1F9E

triadic

#1F309E #9E1F30 #309E1F

tetradic

#1F309E #9E1F6F #9E8D1F #1F9E4E

square

#1F309E #9E1F6F #9E8D1F #1F9E4E

split-complementary

#1F309E #9E4E1F #6F9E1F

monochromatic

#0B1138 #15206B #1F309E #2940D1 #596BDE

Accessibility & contrast

On white

10.63

#1F309E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1F309E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F309E

10.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F309E	#FFFFFF	#000000	##FFFFFF
##1F309E	1.00	10.63	1.97	10.63
#FFFFFF	10.63	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0045A1

Deuteranopia (green-blind)

#00389C

Tritanopia (blue-blind)

#004E63

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f309e;
/* rgb */ color: rgb(31, 48, 158);
/* oklch */ color: oklch(37.9% 0.177 268.7);

Tailwind

colors: {
  custom: {
    50: '#7268bc',
    500: '#1f309e',
    950: '#000000',
  },
}

SCSS

$custom: #1f309e;
$custom-light: #7268bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f309e",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 158
  },
  "hsl": {
    "h": 231.969,
    "s": 67.196,
    "l": 37.059
  },
  "oklch": {
    "l": 0.3792,
    "c": 0.17706,
    "h": 268.7
  },
  "luminance": 0.04874
}

Semantic roles & 50–950 ramp

primary

#1F309E

secondary

#C2B456

accent

#D33EEA

background

#F7F6FB

surface

#EEEBF6

border

#C9C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1F309E

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

Preview Lab → · Contrast checker → · Palette generator →