#1F309D#1F309D

#1F309D is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.8% C 0.176 H 268.7°. Best body text is #FFFFFF at 10.67:1 contrast (WCAG AA passes).

Color values

HEX	#1F309D
RGB	rgb(31, 48, 157)
HSL	hsl(232, 67%, 37%)
HSV	hsv(232, 80%, 62%)
CMYK	cmyk(80.3%, 69.4%, 0%, 38.4%)
CIE-LAB	lab(26.27, 34.20, -60.67)
CIE-LCH	lch(26.27, 69.65, 299.41°)
OKLab	oklab(37.82% -0.004 -0.1757)
OKLCH	oklch(37.82% 0.176 268.7)
XYZ	xyz(7.7057, 4.8386, 32.4196)
Luminance	0.0484 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F309D #9D8C1F

analogous

#1F6F9D #1F309D #4D1F9D

triadic

#1F309D #9D1F30 #309D1F

tetradic

#1F309D #9D1F6F #9D8C1F #1F9D4D

square

#1F309D #9D1F6F #9D8C1F #1F9D4D

split-complementary

#1F309D #9D4D1F #6F9D1F

monochromatic

#0B1137 #15206A #1F309D #2940D0 #586ADE

Accessibility & contrast

On white

10.67

#1F309D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1F309D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F309D

10.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F309D	#FFFFFF	#000000	##FFFFFF
##1F309D	1.00	10.67	1.97	10.67
#FFFFFF	10.67	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0044A0

Deuteranopia (green-blind)

#00389B

Tritanopia (blue-blind)

#004E62

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f309d;
/* rgb */ color: rgb(31, 48, 157);
/* oklch */ color: oklch(37.8% 0.176 268.7);

Tailwind

colors: {
  custom: {
    50: '#7268bb',
    500: '#1f309d',
    950: '#000000',
  },
}

SCSS

$custom: #1f309d;
$custom-light: #7268bb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f309d",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 157
  },
  "hsl": {
    "h": 231.905,
    "s": 67.021,
    "l": 36.863
  },
  "oklch": {
    "l": 0.37817,
    "c": 0.17576,
    "h": 268.7
  },
  "luminance": 0.0484
}

Semantic roles & 50–950 ramp

primary

#1F309D

secondary

#C2B356

accent

#D33EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1F309D

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

Preview Lab → · Contrast checker → · Palette generator →