#1F307D#1F307D

#1F307D is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.7% C 0.132 H 268.9°. Best body text is #FFFFFF at 11.82:1 contrast (WCAG AA passes).

Color values

HEX	#1F307D
RGB	rgb(31, 48, 125)
HSL	hsl(229, 60%, 31%)
HSV	hsv(229, 75%, 49%)
CMYK	cmyk(75.2%, 61.6%, 0%, 51%)
CIE-LAB	lab(23.29, 21.94, -45.70)
CIE-LCH	lch(23.29, 50.69, 295.65°)
OKLab	oklab(34.71% -0.0026 -0.1319)
OKLCH	oklch(34.71% 0.132 268.9)
XYZ	xyz(5.3224, 3.8853, 19.8675)
Luminance	0.0389 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F307D #7D6C1F

analogous

#1F5F7D #1F307D #3D1F7D

triadic

#1F307D #7D1F30 #307D1F

tetradic

#1F307D #7D1F5F #7D6C1F #1F7D3D

square

#1F307D #7D1F5F #7D6C1F #1F7D3D

split-complementary

#1F307D #7D3D1F #5F7D1F

monochromatic

#070A1B #131D4C #1F307D #2B43AE #455FD1

Accessibility & contrast

On white

11.82

#1F307D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1F307D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F307D

11.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F307D	#FFFFFF	#000000	##FFFFFF
##1F307D	1.00	11.82	1.78	11.82
#FFFFFF	11.82	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C80

Deuteranopia (green-blind)

#00337B

Tritanopia (blue-blind)

#004351

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f307d;
/* rgb */ color: rgb(31, 48, 125);
/* oklch */ color: oklch(34.7% 0.132 268.9);

Tailwind

colors: {
  custom: {
    50: '#6968a3',
    500: '#1f307d',
    950: '#000000',
  },
}

SCSS

$custom: #1f307d;
$custom-light: #6968a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f307d",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 125
  },
  "hsl": {
    "h": 229.149,
    "s": 60.256,
    "l": 30.588
  },
  "oklch": {
    "l": 0.34712,
    "c": 0.1319,
    "h": 268.9
  },
  "luminance": 0.03886
}

Semantic roles & 50–950 ramp

primary

#1F307D

secondary

#B09D48

accent

#C744E3

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F307D

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

Preview Lab → · Contrast checker → · Palette generator →