#1C378F#1C378F

#1C378F is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.6% C 0.149 H 266.1°. Best body text is #FFFFFF at 10.54:1 contrast (WCAG AA passes).

Color values

HEX	#1C378F
RGB	rgb(28, 55, 143)
HSL	hsl(226, 67%, 34%)
HSV	hsv(226, 80%, 56%)
CMYK	cmyk(80.4%, 61.5%, 0%, 43.9%)
CIE-LAB	lab(26.63, 23.85, -51.50)
CIE-LCH	lch(26.63, 56.76, 294.85°)
OKLab	oklab(37.64% -0.0101 -0.1489)
OKLCH	oklch(37.64% 0.149 266.1)
XYZ	xyz(6.8013, 4.9616, 26.5805)
Luminance	0.0496 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1C378F #8F741C

analogous

#1C708F #1C378F #3A1C8F

triadic

#1C378F #8F1C37 #378F1C

tetradic

#1C378F #8F1C70 #8F741C #1C8F3A

square

#1C378F #8F1C70 #8F741C #1C8F3A

split-complementary

#1C378F #8F3A1C #708F1C

monochromatic

#081029 #12235C #1C378F #264BC2 #4A6CDC

Accessibility & contrast

On white

10.54

#1C378F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#1C378F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1C378F

10.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1C378F	#FFFFFF	#000000	##FFFFFF
##1C378F	1.00	10.54	1.99	10.54
#FFFFFF	10.54	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004492

Deuteranopia (green-blind)

#003A8D

Tritanopia (blue-blind)

#004D5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1c378f;
/* rgb */ color: rgb(28, 55, 143);
/* oklch */ color: oklch(37.6% 0.149 266.1);

Tailwind

colors: {
  custom: {
    50: '#6c6db1',
    500: '#1c378f',
    950: '#000000',
  },
}

SCSS

$custom: #1c378f;
$custom-light: #6c6db1;
$custom-dark: #000000;

JSON

{
  "hex": "#1c378f",
  "rgb": {
    "r": 28,
    "g": 55,
    "b": 143
  },
  "hsl": {
    "h": 225.913,
    "s": 67.251,
    "l": 33.529
  },
  "oklch": {
    "l": 0.37644,
    "c": 0.14923,
    "h": 266.1
  },
  "luminance": 0.04962
}

Semantic roles & 50–950 ramp

primary

#1C378F

secondary

#BEA249

accent

#C23EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1C378F

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

Preview Lab → · Contrast checker → · Palette generator →