#1F307C#1F307C

#1F307C is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.6% C 0.130 H 268.9°. Best body text is #FFFFFF at 11.85:1 contrast (WCAG AA passes).

Color values

HEX	#1F307C
RGB	rgb(31, 48, 124)
HSL	hsl(229, 60%, 30%)
HSV	hsv(229, 75%, 49%)
CMYK	cmyk(75%, 61.3%, 0%, 51.4%)
CIE-LAB	lab(23.20, 21.55, -45.21)
CIE-LCH	lch(23.20, 50.08, 295.49°)
OKLab	oklab(34.62% -0.0026 -0.1304)
OKLCH	oklch(34.62% 0.13 268.9)
XYZ	xyz(5.2589, 3.8599, 19.5328)
Luminance	0.0386 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F307C #7C6B1F

analogous

#1F5E7C #1F307C #3C1F7C

triadic

#1F307C #7C1F30 #307C1F

tetradic

#1F307C #7C1F5E #7C6B1F #1F7C3C

square

#1F307C #7C1F5E #7C6B1F #1F7C3C

split-complementary

#1F307C #7C3C1F #5E7C1F

monochromatic

#070A1A #131D4B #1F307C #2B43AD #455ED0

Accessibility & contrast

On white

11.85

#1F307C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1F307C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F307C

11.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F307C	#FFFFFF	#000000	##FFFFFF
##1F307C	1.00	11.85	1.77	11.85
#FFFFFF	11.85	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C7F

Deuteranopia (green-blind)

#00337B

Tritanopia (blue-blind)

#004351

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f307c;
/* rgb */ color: rgb(31, 48, 124);
/* oklch */ color: oklch(34.6% 0.130 268.9);

Tailwind

colors: {
  custom: {
    50: '#6968a3',
    500: '#1f307c',
    950: '#000000',
  },
}

SCSS

$custom: #1f307c;
$custom-light: #6968a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f307c",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 124
  },
  "hsl": {
    "h": 229.032,
    "s": 60,
    "l": 30.392
  },
  "oklch": {
    "l": 0.34622,
    "c": 0.13047,
    "h": 268.9
  },
  "luminance": 0.0386
}

Semantic roles & 50–950 ramp

primary

#1F307C

secondary

#AF9C48

accent

#C645E3

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F307C

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

Preview Lab → · Contrast checker → · Palette generator →