#1B317D#1B317D

#1B317D is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.7% C 0.132 H 266.9°. Best body text is #FFFFFF at 11.78:1 contrast (WCAG AA passes).

Color values

HEX	#1B317D
RGB	rgb(27, 49, 125)
HSL	hsl(227, 64%, 30%)
HSV	hsv(227, 78%, 49%)
CMYK	cmyk(78.4%, 60.8%, 0%, 51%)
CIE-LAB	lab(23.37, 20.73, -45.57)
CIE-LCH	lch(23.37, 50.07, 294.46°)
OKLab	oklab(34.72% -0.0072 -0.1316)
OKLCH	oklch(34.72% 0.132 266.9)
XYZ	xyz(5.2507, 3.9097, 19.8760)
Luminance	0.0391 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B317D #7D671B

analogous

#1B627D #1B317D #361B7D

triadic

#1B317D #7D1B31 #317D1B

tetradic

#1B317D #7D1B62 #7D671B #1B7D36

square

#1B317D #7D1B62 #7D671B #1B7D36

split-complementary

#1B317D #7D361B #627D1B

monochromatic

#050A19 #101D4B #1B317D #2645AF #3D5FD5

Accessibility & contrast

On white

11.78

#1B317D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1B317D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B317D

11.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B317D	#FFFFFF	#000000	##FFFFFF
##1B317D	1.00	11.78	1.78	11.78
#FFFFFF	11.78	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C80

Deuteranopia (green-blind)

#00337C

Tritanopia (blue-blind)

#004452

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b317d;
/* rgb */ color: rgb(27, 49, 125);
/* oklch */ color: oklch(34.7% 0.132 266.9);

Tailwind

colors: {
  custom: {
    50: '#6868a3',
    500: '#1b317d',
    950: '#000000',
  },
}

SCSS

$custom: #1b317d;
$custom-light: #6868a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b317d",
  "rgb": {
    "r": 27,
    "g": 49,
    "b": 125
  },
  "hsl": {
    "h": 226.531,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.3472,
    "c": 0.13179,
    "h": 266.9
  },
  "luminance": 0.0391
}

Semantic roles & 50–950 ramp

primary

#1B317D

secondary

#B19843

accent

#C240E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B317D

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

Preview Lab → · Contrast checker → · Palette generator →