#1F309C#1F309C

#1F309C is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.7% C 0.174 H 268.7°. Best body text is #FFFFFF at 10.71:1 contrast (WCAG AA passes).

Color values

HEX	#1F309C
RGB	rgb(31, 48, 156)
HSL	hsl(232, 67%, 37%)
HSV	hsv(232, 80%, 61%)
CMYK	cmyk(80.1%, 69.2%, 0%, 38.8%)
CIE-LAB	lab(26.17, 33.83, -60.22)
CIE-LCH	lch(26.17, 69.08, 299.33°)
OKLab	oklab(37.71% -0.0039 -0.1744)
OKLCH	oklch(37.71% 0.174 268.7)
XYZ	xyz(7.6207, 4.8046, 31.9718)
Luminance	0.0481 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F309C #9C8B1F

analogous

#1F6F9C #1F309C #4D1F9C

triadic

#1F309C #9C1F30 #309C1F

tetradic

#1F309C #9C1F6F #9C8B1F #1F9C4D

square

#1F309C #9C1F6F #9C8B1F #1F9C4D

split-complementary

#1F309C #9C4D1F #6F9C1F

monochromatic

#0B1136 #152069 #1F309C #2940CF #586ADE

Accessibility & contrast

On white

10.71

#1F309C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#1F309C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F309C

10.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F309C	#FFFFFF	#000000	##FFFFFF
##1F309C	1.00	10.71	1.96	10.71
#FFFFFF	10.71	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00449F

Deuteranopia (green-blind)

#00389A

Tritanopia (blue-blind)

#004E62

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f309c;
/* rgb */ color: rgb(31, 48, 156);
/* oklch */ color: oklch(37.7% 0.174 268.7);

Tailwind

colors: {
  custom: {
    50: '#7168ba',
    500: '#1f309c',
    950: '#000000',
  },
}

SCSS

$custom: #1f309c;
$custom-light: #7168ba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f309c",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 156
  },
  "hsl": {
    "h": 231.84,
    "s": 66.845,
    "l": 36.667
  },
  "oklch": {
    "l": 0.37715,
    "c": 0.17445,
    "h": 268.7
  },
  "luminance": 0.04806
}

Semantic roles & 50–950 ramp

primary

#1F309C

secondary

#C1B355

accent

#D23EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1F309C

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

Preview Lab → · Contrast checker → · Palette generator →