#1F399B#1F399B

#1F399B is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.3% C 0.162 H 266.9°. Best body text is #FFFFFF at 9.92:1 contrast (WCAG AA passes).

Color values

HEX	#1F399B
RGB	rgb(31, 57, 155)
HSL	hsl(227, 67%, 36%)
HSV	hsv(227, 80%, 61%)
CMYK	cmyk(80%, 63.2%, 0%, 39.2%)
CIE-LAB	lab(28.34, 27.49, -56.06)
CIE-LCH	lch(28.34, 62.44, 296.12°)
OKLab	oklab(39.28% -0.0088 -0.1622)
OKLCH	oklch(39.28% 0.162 266.9)
XYZ	xyz(7.9425, 5.5832, 31.6631)
Luminance	0.0558 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F399B #9B811F

analogous

#1F779B #1F399B #431F9B

triadic

#1F399B #9B1F39 #399B1F

tetradic

#1F399B #9B1F77 #9B811F #1F9B43

square

#1F399B #9B1F77 #9B811F #1F9B43

split-complementary

#1F399B #9B431F #779B1F

monochromatic

#0B1335 #152668 #1F399B #294CCE #5773DD

Accessibility & contrast

On white

9.92

#1F399B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#1F399B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F399B

9.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F399B	#FFFFFF	#000000	##FFFFFF
##1F399B	1.00	9.92	2.12	9.92
#FFFFFF	9.92	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00499E

Deuteranopia (green-blind)

#003D99

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1f399b;
/* rgb */ color: rgb(31, 57, 155);
/* oklch */ color: oklch(39.3% 0.162 266.9);

Tailwind

colors: {
  custom: {
    50: '#706fb9',
    500: '#1f399b',
    950: '#000000',
  },
}

SCSS

$custom: #1f399b;
$custom-light: #706fb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f399b",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 155
  },
  "hsl": {
    "h": 227.419,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.39275,
    "c": 0.16241,
    "h": 266.9
  },
  "luminance": 0.05584
}

Semantic roles & 50–950 ramp

primary

#1F399B

secondary

#C1AA55

accent

#C63EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F399B

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

Preview Lab → · Contrast checker → · Palette generator →