#1B378F#1B378F

#1B378F is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.6% C 0.149 H 265.8°. Best body text is #FFFFFF at 10.55:1 contrast (WCAG AA passes).

Color values

HEX	#1B378F
RGB	rgb(27, 55, 143)
HSL	hsl(226, 68%, 33%)
HSV	hsv(226, 81%, 56%)
CMYK	cmyk(81.1%, 61.5%, 0%, 43.9%)
CIE-LAB	lab(26.59, 23.75, -51.57)
CIE-LCH	lch(26.59, 56.78, 294.73°)
OKLab	oklab(37.6% -0.0109 -0.1491)
OKLCH	oklch(37.6% 0.15 265.8)
XYZ	xyz(6.7744, 4.9478, 26.5793)
Luminance	0.0495 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B378F #8F731B

analogous

#1B718F #1B378F #391B8F

triadic

#1B378F #8F1B37 #378F1B

tetradic

#1B378F #8F1B71 #8F731B #1B8F39

square

#1B378F #8F1B71 #8F731B #1B8F39

split-complementary

#1B378F #8F391B #718F1B

monochromatic

#080F28 #11235C #1B378F #254BC2 #486CDC

Accessibility & contrast

On white

10.55

#1B378F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#1B378F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B378F

10.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B378F	#FFFFFF	#000000	##FFFFFF
##1B378F	1.00	10.55	1.99	10.55
#FFFFFF	10.55	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004492

Deuteranopia (green-blind)

#003A8D

Tritanopia (blue-blind)

#004E5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b378f;
/* rgb */ color: rgb(27, 55, 143);
/* oklch */ color: oklch(37.6% 0.149 265.8);

Tailwind

colors: {
  custom: {
    50: '#6c6db1',
    500: '#1b378f',
    950: '#000000',
  },
}

SCSS

$custom: #1b378f;
$custom-light: #6c6db1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b378f",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 143
  },
  "hsl": {
    "h": 225.517,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.37603,
    "c": 0.1495,
    "h": 265.8
  },
  "luminance": 0.04949
}

Semantic roles & 50–950 ramp

primary

#1B378F

secondary

#BEA248

accent

#C13DEB

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B378F

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

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