#21378B#21378B

#21378B is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.5% C 0.142 H 267.7°. Best body text is #FFFFFF at 10.58:1 contrast (WCAG AA passes).

Color values

HEX	#21378B
RGB	rgb(33, 55, 139)
HSL	hsl(228, 62%, 34%)
HSV	hsv(228, 76%, 55%)
CMYK	cmyk(76.3%, 60.4%, 0%, 45.5%)
CIE-LAB	lab(26.50, 22.85, -49.22)
CIE-LCH	lch(26.50, 54.26, 294.90°)
OKLab	oklab(37.51% -0.0058 -0.1421)
OKLCH	oklch(37.51% 0.142 267.7)
XYZ	xyz(6.6520, 4.9191, 25.0200)
Luminance	0.0492 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#21378B #8B7521

analogous

#216C8B #21378B #40218B

triadic

#21378B #8B2137 #378B21

tetradic

#21378B #8B216C #8B7521 #218B40

square

#21378B #8B216C #8B7521 #218B40

split-complementary

#21378B #8B4021 #6C8B21

monochromatic

#0A1028 #15235A #21378B #2D4BBC #516CD6

Accessibility & contrast

On white

10.58

#21378B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#21378B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #21378B

10.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##21378B	#FFFFFF	#000000	##FFFFFF
##21378B	1.00	10.58	1.98	10.58
#FFFFFF	10.58	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448E

Deuteranopia (green-blind)

#003A89

Tritanopia (blue-blind)

#004C5B

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #21378b;
/* rgb */ color: rgb(33, 55, 139);
/* oklch */ color: oklch(37.5% 0.142 267.7);

Tailwind

colors: {
  custom: {
    50: '#6d6dae',
    500: '#21378b',
    950: '#000000',
  },
}

SCSS

$custom: #21378b;
$custom-light: #6d6dae;
$custom-dark: #000000;

JSON

{
  "hex": "#21378b",
  "rgb": {
    "r": 33,
    "g": 55,
    "b": 139
  },
  "hsl": {
    "h": 227.547,
    "s": 61.628,
    "l": 33.725
  },
  "oklch": {
    "l": 0.37507,
    "c": 0.1422,
    "h": 267.7
  },
  "luminance": 0.0492
}

Semantic roles & 50–950 ramp

primary

#21378B

secondary

#B9A34F

accent

#C343E5

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #21378B

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

Preview Lab → · Contrast checker → · Palette generator →