#1B399F#1B399F

#1B399F is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.5% C 0.169 H 265.9°. Best body text is #FFFFFF at 9.85:1 contrast (WCAG AA passes).

Color values

HEX	#1B399F
RGB	rgb(27, 57, 159)
HSL	hsl(226, 71%, 36%)
HSV	hsv(226, 83%, 62%)
CMYK	cmyk(83%, 64.2%, 0%, 37.6%)
CIE-LAB	lab(28.54, 28.68, -58.16)
CIE-LCH	lch(28.54, 64.85, 296.25°)
OKLab	oklab(39.5% -0.0121 -0.1684)
OKLCH	oklch(39.5% 0.169 265.9)
XYZ	xyz(8.1709, 5.6615, 33.4563)
Luminance	0.0566 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B399F #9F811B

analogous

#1B7B9F #1B399F #3F1B9F

triadic

#1B399F #9F1B39 #399F1B

tetradic

#1B399F #9F1B7B #9F811B #1B9F3F

square

#1B399F #9F1B7B #9F811B #1B9F3F

split-complementary

#1B399F #9F3F1B #7B9F1B

monochromatic

#091336 #12266B #1B399F #244CD3 #5373E2

Accessibility & contrast

On white

9.85

#1B399F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#1B399F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B399F

9.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B399F	#FFFFFF	#000000	##FFFFFF
##1B399F	1.00	9.85	2.13	9.85
#FFFFFF	9.85	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AA2

Deuteranopia (green-blind)

#003D9D

Tritanopia (blue-blind)

#005466

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b399f;
/* rgb */ color: rgb(27, 57, 159);
/* oklch */ color: oklch(39.5% 0.169 265.9);

Tailwind

colors: {
  custom: {
    50: '#706fbc',
    500: '#1b399f',
    950: '#000000',
  },
}

SCSS

$custom: #1b399f;
$custom-light: #706fbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b399f",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 159
  },
  "hsl": {
    "h": 226.364,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.39495,
    "c": 0.16882,
    "h": 265.9
  },
  "luminance": 0.05662
}

Semantic roles & 50–950 ramp

primary

#1B399F

secondary

#C5AA51

accent

#C53AEE

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B399F

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

Preview Lab → · Contrast checker → · Palette generator →