#1B317F#1B317F

#1B317F is a dark, vivid blue. Relative luminance 0.040; OKLCH L 34.9% C 0.135 H 267.0°. Best body text is #FFFFFF at 11.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B317F
RGB	rgb(27, 49, 127)
HSL	hsl(227, 65%, 30%)
HSV	hsv(227, 79%, 50%)
CMYK	cmyk(78.7%, 61.4%, 0%, 50.2%)
CIE-LAB	lab(23.54, 21.53, -46.55)
CIE-LCH	lch(23.54, 51.29, 294.82°)
OKLab	oklab(34.9% -0.0071 -0.1345)
OKLCH	oklch(34.9% 0.135 267)
XYZ	xyz(5.3797, 3.9613, 20.5556)
Luminance	0.0396 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B317F #7F691B

analogous

#1B637F #1B317F #371B7F

triadic

#1B317F #7F1B31 #317F1B

tetradic

#1B317F #7F1B63 #7F691B #1B7F37

square

#1B317F #7F1B63 #7F691B #1B7F37

split-complementary

#1B317F #7F371B #637F1B

monochromatic

#060A1A #101E4D #1B317F #2644B1 #3E60D6

Accessibility & contrast

On white

11.72

#1B317F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1B317F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B317F

11.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B317F	#FFFFFF	#000000	##FFFFFF
##1B317F	1.00	11.72	1.79	11.72
#FFFFFF	11.72	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D82

Deuteranopia (green-blind)

#00347D

Tritanopia (blue-blind)

#004553

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b317f;
/* rgb */ color: rgb(27, 49, 127);
/* oklch */ color: oklch(34.9% 0.135 267.0);

Tailwind

colors: {
  custom: {
    50: '#6868a5',
    500: '#1b317f',
    950: '#000000',
  },
}

SCSS

$custom: #1b317f;
$custom-light: #6868a5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b317f",
  "rgb": {
    "r": 27,
    "g": 49,
    "b": 127
  },
  "hsl": {
    "h": 226.8,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.34902,
    "c": 0.13466,
    "h": 267
  },
  "luminance": 0.03962
}

Semantic roles & 50–950 ramp

primary

#1B317F

secondary

#B39A43

accent

#C340E8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B317F

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

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