#1F307A#1F307A

#1F307A is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.4% C 0.128 H 268.8°. Best body text is #FFFFFF at 11.92:1 contrast (WCAG AA passes).

Color values

HEX	#1F307A
RGB	rgb(31, 48, 122)
HSL	hsl(229, 59%, 30%)
HSV	hsv(229, 75%, 48%)
CMYK	cmyk(74.6%, 60.7%, 0%, 52.2%)
CIE-LAB	lab(23.03, 20.76, -44.22)
CIE-LCH	lch(23.03, 48.85, 295.15°)
OKLab	oklab(34.44% -0.0026 -0.1275)
OKLCH	oklch(34.44% 0.128 268.8)
XYZ	xyz(5.1337, 3.8098, 18.8734)
Luminance	0.0381 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F307A #7A691F

analogous

#1F5E7A #1F307A #3B1F7A

triadic

#1F307A #7A1F30 #307A1F

tetradic

#1F307A #7A1F5E #7A691F #1F7A3B

square

#1F307A #7A1F5E #7A691F #1F7A3B

split-complementary

#1F307A #7A3B1F #5E7A1F

monochromatic

#060A18 #131D49 #1F307A #2B43AB #445ECF

Accessibility & contrast

On white

11.92

#1F307A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#1F307A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F307A

11.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F307A	#FFFFFF	#000000	##FFFFFF
##1F307A	1.00	11.92	1.76	11.92
#FFFFFF	11.92	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B7C

Deuteranopia (green-blind)

#003379

Tritanopia (blue-blind)

#004250

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f307a;
/* rgb */ color: rgb(31, 48, 122);
/* oklch */ color: oklch(34.4% 0.128 268.8);

Tailwind

colors: {
  custom: {
    50: '#6868a1',
    500: '#1f307a',
    950: '#000000',
  },
}

SCSS

$custom: #1f307a;
$custom-light: #6868a1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f307a",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 122
  },
  "hsl": {
    "h": 228.791,
    "s": 59.477,
    "l": 30
  },
  "oklch": {
    "l": 0.34441,
    "c": 0.12756,
    "h": 268.8
  },
  "luminance": 0.0381
}

Semantic roles & 50–950 ramp

primary

#1F307A

secondary

#AD9A47

accent

#C545E3

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F307A

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

Preview Lab → · Contrast checker → · Palette generator →