#12378F#12378F

#12378F is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.3% C 0.152 H 263.5°. Best body text is #FFFFFF at 10.67:1 contrast (WCAG AA passes).

Color values

HEX	#12378F
RGB	rgb(18, 55, 143)
HSL	hsl(222, 78%, 32%)
HSV	hsv(222, 87%, 56%)
CMYK	cmyk(87.4%, 61.5%, 0%, 43.9%)
CIE-LAB	lab(26.28, 22.96, -52.08)
CIE-LCH	lch(26.28, 56.91, 293.79°)
OKLab	oklab(37.29% -0.0172 -0.1507)
OKLCH	oklch(37.29% 0.152 263.5)
XYZ	xyz(6.5718, 4.8433, 26.5698)
Luminance	0.0484 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#12378F #8F6A12

analogous

#12768F #12378F #2C128F

triadic

#12378F #8F1237 #378F12

tetradic

#12378F #8F1276 #8F6A12 #128F2C

square

#12378F #8F1276 #8F6A12 #128F2C

split-complementary

#12378F #8F2C12 #768F12

monochromatic

#040D22 #0B2259 #12378F #194CC5 #366AE6

Accessibility & contrast

On white

10.67

#12378F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#12378F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #12378F

10.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##12378F	#FFFFFF	#000000	##FFFFFF
##12378F	1.00	10.67	1.97	10.67
#FFFFFF	10.67	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004492

Deuteranopia (green-blind)

#00398D

Tritanopia (blue-blind)

#004E5D

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #12378f;
/* rgb */ color: rgb(18, 55, 143);
/* oklch */ color: oklch(37.3% 0.152 263.5);

Tailwind

colors: {
  custom: {
    50: '#6a6db1',
    500: '#12378f',
    950: '#000000',
  },
}

SCSS

$custom: #12378f;
$custom-light: #6a6db1;
$custom-dark: #000000;

JSON

{
  "hex": "#12378f",
  "rgb": {
    "r": 18,
    "g": 55,
    "b": 143
  },
  "hsl": {
    "h": 222.24,
    "s": 77.64,
    "l": 31.569
  },
  "oklch": {
    "l": 0.37293,
    "c": 0.1517,
    "h": 263.5
  },
  "luminance": 0.04844
}

Semantic roles & 50–950 ramp

primary

#12378F

secondary

#C39A3A

accent

#BB34F4

background

#F6F6FB

surface

#ECEBF6

border

#C7C6D0

text

#080711

muted

#7A7A80

Preview Lab

Preview with #12378F

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

Preview Lab → · Contrast checker → · Palette generator →