#1F307E#1F307E

#1F307E is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.8% C 0.133 H 268.9°. Best body text is #FFFFFF at 11.78:1 contrast (WCAG AA passes).

Color values

HEX	#1F307E
RGB	rgb(31, 48, 126)
HSL	hsl(229, 61%, 31%)
HSV	hsv(229, 75%, 49%)
CMYK	cmyk(75.4%, 61.9%, 0%, 50.6%)
CIE-LAB	lab(23.38, 22.34, -46.19)
CIE-LCH	lch(23.38, 51.31, 295.81°)
OKLab	oklab(34.8% -0.0026 -0.1333)
OKLCH	oklch(34.8% 0.133 268.9)
XYZ	xyz(5.3866, 3.9110, 20.2056)
Luminance	0.0391 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F307E #7E6D1F

analogous

#1F5F7E #1F307E #3D1F7E

triadic

#1F307E #7E1F30 #307E1F

tetradic

#1F307E #7E1F5F #7E6D1F #1F7E3D

square

#1F307E #7E1F5F #7E6D1F #1F7E3D

split-complementary

#1F307E #7E3D1F #5F7E1F

monochromatic

#070B1C #131D4D #1F307E #2B43AF #465FD1

Accessibility & contrast

On white

11.78

#1F307E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1F307E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F307E

11.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F307E	#FFFFFF	#000000	##FFFFFF
##1F307E	1.00	11.78	1.78	11.78
#FFFFFF	11.78	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C81

Deuteranopia (green-blind)

#00337C

Tritanopia (blue-blind)

#004452

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1f307e;
/* rgb */ color: rgb(31, 48, 126);
/* oklch */ color: oklch(34.8% 0.133 268.9);

Tailwind

colors: {
  custom: {
    50: '#6968a4',
    500: '#1f307e',
    950: '#000000',
  },
}

SCSS

$custom: #1f307e;
$custom-light: #6968a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1f307e",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 126
  },
  "hsl": {
    "h": 229.263,
    "s": 60.51,
    "l": 30.784
  },
  "oklch": {
    "l": 0.34804,
    "c": 0.13334,
    "h": 268.9
  },
  "luminance": 0.03912
}

Semantic roles & 50–950 ramp

primary

#1F307E

secondary

#B19E48

accent

#C744E4

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F307E

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

Preview Lab → · Contrast checker → · Palette generator →