#1F399E#1F399E

#1F399E is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.6% C 0.166 H 266.9°. Best body text is #FFFFFF at 9.83:1 contrast (WCAG AA passes).

Color values

HEX	#1F399E
RGB	rgb(31, 57, 158)
HSL	hsl(228, 67%, 37%)
HSV	hsv(228, 80%, 62%)
CMYK	cmyk(80.4%, 63.9%, 0%, 38%)
CIE-LAB	lab(28.60, 28.65, -57.45)
CIE-LCH	lch(28.60, 64.20, 296.51°)
OKLab	oklab(39.56% -0.0089 -0.1662)
OKLCH	oklch(39.56% 0.166 266.9)
XYZ	xyz(8.1976, 5.6852, 33.0064)
Luminance	0.0569 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F399E #9E841F

analogous

#1F789E #1F399E #451F9E

triadic

#1F399E #9E1F39 #399E1F

tetradic

#1F399E #9E1F78 #9E841F #1F9E45

square

#1F399E #9E1F78 #9E841F #1F9E45

split-complementary

#1F399E #9E451F #789E1F

monochromatic

#0B1438 #15276B #1F399E #294BD1 #5974DE

Accessibility & contrast

On white

9.83

#1F399E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1F399E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F399E

9.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F399E	#FFFFFF	#000000	##FFFFFF
##1F399E	1.00	9.83	2.14	9.83
#FFFFFF	9.83	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AA1

Deuteranopia (green-blind)

#003E9C

Tritanopia (blue-blind)

#005366

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1f399e;
/* rgb */ color: rgb(31, 57, 158);
/* oklch */ color: oklch(39.6% 0.166 266.9);

Tailwind

colors: {
  custom: {
    50: '#716fbc',
    500: '#1f399e',
    950: '#000000',
  },
}

SCSS

$custom: #1f399e;
$custom-light: #716fbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f399e",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 158
  },
  "hsl": {
    "h": 227.717,
    "s": 67.196,
    "l": 37.059
  },
  "oklch": {
    "l": 0.39556,
    "c": 0.16646,
    "h": 266.9
  },
  "luminance": 0.05686
}

Semantic roles & 50–950 ramp

primary

#1F399E

secondary

#C2AC56

accent

#C73EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F399E

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

Preview Lab → · Contrast checker → · Palette generator →