#1F307F#1F307F

#1F307F is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.9% C 0.135 H 268.9°. Best body text is #FFFFFF at 11.75:1 contrast (WCAG AA passes).

Color values

HEX	#1F307F
RGB	rgb(31, 48, 127)
HSL	hsl(229, 61%, 31%)
HSV	hsv(229, 76%, 50%)
CMYK	cmyk(75.6%, 62.2%, 0%, 50.2%)
CIE-LAB	lab(23.46, 22.73, -46.68)
CIE-LCH	lch(23.46, 51.92, 295.96°)
OKLab	oklab(34.89% -0.0026 -0.1348)
OKLCH	oklch(34.89% 0.135 268.9)
XYZ	xyz(5.4515, 3.9369, 20.5472)
Luminance	0.0394 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F307F #7F6E1F

analogous

#1F607F #1F307F #3E1F7F

triadic

#1F307F #7F1F30 #307F1F

tetradic

#1F307F #7F1F60 #7F6E1F #1F7F3E

square

#1F307F #7F1F60 #7F6E1F #1F7F3E

split-complementary

#1F307F #7F3E1F #607F1F

monochromatic

#070B1D #131D4E #1F307F #2B43B0 #465FD2

Accessibility & contrast

On white

11.75

#1F307F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1F307F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F307F

11.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F307F	#FFFFFF	#000000	##FFFFFF
##1F307F	1.00	11.75	1.79	11.75
#FFFFFF	11.75	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C82

Deuteranopia (green-blind)

#00347D

Tritanopia (blue-blind)

#004452

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1f307f;
/* rgb */ color: rgb(31, 48, 127);
/* oklch */ color: oklch(34.9% 0.135 268.9);

Tailwind

colors: {
  custom: {
    50: '#6a68a5',
    500: '#1f307f',
    950: '#000000',
  },
}

SCSS

$custom: #1f307f;
$custom-light: #6a68a5;
$custom-dark: #000000;

JSON

{
  "hex": "#1f307f",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 127
  },
  "hsl": {
    "h": 229.375,
    "s": 60.759,
    "l": 30.98
  },
  "oklch": {
    "l": 0.34895,
    "c": 0.13478,
    "h": 268.9
  },
  "luminance": 0.03938
}

Semantic roles & 50–950 ramp

primary

#1F307F

secondary

#B29F48

accent

#C844E4

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F307F

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

Preview Lab → · Contrast checker → · Palette generator →