#1F399C#1F399C

#1F399C is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.4% C 0.164 H 266.9°. Best body text is #FFFFFF at 9.89:1 contrast (WCAG AA passes).

Color values

HEX	#1F399C
RGB	rgb(31, 57, 156)
HSL	hsl(228, 67%, 37%)
HSV	hsv(228, 80%, 61%)
CMYK	cmyk(80.1%, 63.5%, 0%, 38.8%)
CIE-LAB	lab(28.42, 27.88, -56.53)
CIE-LCH	lch(28.42, 63.03, 296.26°)
OKLab	oklab(39.37% -0.0088 -0.1635)
OKLCH	oklch(39.37% 0.164 266.9)
XYZ	xyz(8.0269, 5.6169, 32.1072)
Luminance	0.0562 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F399C #9C821F

analogous

#1F789C #1F399C #441F9C

triadic

#1F399C #9C1F39 #399C1F

tetradic

#1F399C #9C1F78 #9C821F #1F9C44

square

#1F399C #9C1F78 #9C821F #1F9C44

split-complementary

#1F399C #9C441F #789C1F

monochromatic

#0B1436 #152669 #1F399C #294CCF #5874DE

Accessibility & contrast

On white

9.89

#1F399C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#1F399C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F399C

9.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F399C	#FFFFFF	#000000	##FFFFFF
##1F399C	1.00	9.89	2.12	9.89
#FFFFFF	9.89	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00499F

Deuteranopia (green-blind)

#003D9A

Tritanopia (blue-blind)

#005365

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1f399c;
/* rgb */ color: rgb(31, 57, 156);
/* oklch */ color: oklch(39.4% 0.164 266.9);

Tailwind

colors: {
  custom: {
    50: '#706fba',
    500: '#1f399c',
    950: '#000000',
  },
}

SCSS

$custom: #1f399c;
$custom-light: #706fba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f399c",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 156
  },
  "hsl": {
    "h": 227.52,
    "s": 66.845,
    "l": 36.667
  },
  "oklch": {
    "l": 0.39368,
    "c": 0.16376,
    "h": 266.9
  },
  "luminance": 0.05618
}

Semantic roles & 50–950 ramp

primary

#1F399C

secondary

#C1AB55

accent

#C63EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F399C

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

Preview Lab → · Contrast checker → · Palette generator →