#1F307B#1F307B

#1F307B is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.5% C 0.129 H 268.9°. Best body text is #FFFFFF at 11.88:1 contrast (WCAG AA passes).

Color values

HEX	#1F307B
RGB	rgb(31, 48, 123)
HSL	hsl(229, 60%, 30%)
HSV	hsv(229, 75%, 48%)
CMYK	cmyk(74.8%, 61%, 0%, 51.8%)
CIE-LAB	lab(23.12, 21.15, -44.71)
CIE-LCH	lch(23.12, 49.46, 295.32°)
OKLab	oklab(34.53% -0.0026 -0.129)
OKLCH	oklch(34.53% 0.129 268.9)
XYZ	xyz(5.1959, 3.8347, 19.2014)
Luminance	0.0384 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F307B #7B6A1F

analogous

#1F5E7B #1F307B #3C1F7B

triadic

#1F307B #7B1F30 #307B1F

tetradic

#1F307B #7B1F5E #7B6A1F #1F7B3C

square

#1F307B #7B1F5E #7B6A1F #1F7B3C

split-complementary

#1F307B #7B3C1F #5E7B1F

monochromatic

#060A19 #131D4A #1F307B #2B43AC #445ED0

Accessibility & contrast

On white

11.88

#1F307B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1F307B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F307B

11.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F307B	#FFFFFF	#000000	##FFFFFF
##1F307B	1.00	11.88	1.77	11.88
#FFFFFF	11.88	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C7E

Deuteranopia (green-blind)

#00337A

Tritanopia (blue-blind)

#004350

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f307b;
/* rgb */ color: rgb(31, 48, 123);
/* oklch */ color: oklch(34.5% 0.129 268.9);

Tailwind

colors: {
  custom: {
    50: '#6968a2',
    500: '#1f307b',
    950: '#000000',
  },
}

SCSS

$custom: #1f307b;
$custom-light: #6968a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f307b",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 123
  },
  "hsl": {
    "h": 228.913,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.34531,
    "c": 0.12901,
    "h": 268.9
  },
  "luminance": 0.03835
}

Semantic roles & 50–950 ramp

primary

#1F307B

secondary

#AE9B48

accent

#C645E3

background

#F6F6FA

surface

#ECEBF3

border

#C7C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F307B

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

Preview Lab → · Contrast checker → · Palette generator →