#1F308D#1F308D

#1F308D is a dark, vivid blue. Relative luminance 0.043; OKLCH L 36.2% C 0.154 H 268.9°. Best body text is #FFFFFF at 11.26:1 contrast (WCAG AA passes).

Color values

HEX	#1F308D
RGB	rgb(31, 48, 141)
HSL	hsl(231, 64%, 34%)
HSV	hsv(231, 78%, 55%)
CMYK	cmyk(78%, 66%, 0%, 44.7%)
CIE-LAB	lab(24.73, 28.17, -53.37)
CIE-LCH	lch(24.73, 60.35, 297.83°)
OKLab	oklab(36.22% -0.0029 -0.1544)
OKLCH	oklch(36.22% 0.154 268.9)
XYZ	xyz(6.4281, 4.3276, 25.6907)
Luminance	0.0433 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F308D #8D7C1F

analogous

#1F678D #1F308D #451F8D

triadic

#1F308D #8D1F30 #308D1F

tetradic

#1F308D #8D1F67 #8D7C1F #1F8D45

square

#1F308D #8D1F67 #8D7C1F #1F8D45

split-complementary

#1F308D #8D451F #678D1F

monochromatic

#090E29 #141F5B #1F308D #2A41BF #4E64D8

Accessibility & contrast

On white

11.26

#1F308D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#1F308D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F308D

11.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F308D	#FFFFFF	#000000	##FFFFFF
##1F308D	1.00	11.26	1.87	11.26
#FFFFFF	11.26	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004090

Deuteranopia (green-blind)

#00368B

Tritanopia (blue-blind)

#00495A

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1f308d;
/* rgb */ color: rgb(31, 48, 141);
/* oklch */ color: oklch(36.2% 0.154 268.9);

Tailwind

colors: {
  custom: {
    50: '#6d68af',
    500: '#1f308d',
    950: '#000000',
  },
}

SCSS

$custom: #1f308d;
$custom-light: #6d68af;
$custom-dark: #000000;

JSON

{
  "hex": "#1f308d",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 141
  },
  "hsl": {
    "h": 230.727,
    "s": 63.953,
    "l": 33.725
  },
  "oklch": {
    "l": 0.3622,
    "c": 0.1544,
    "h": 268.9
  },
  "luminance": 0.04328
}

Semantic roles & 50–950 ramp

primary

#1F308D

secondary

#BBAA4D

accent

#CD41E7

background

#F7F6FA

surface

#EDEBF5

border

#C8C6CF

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F308D

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

Preview Lab → · Contrast checker → · Palette generator →