#21309B#21309B

#21309B is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.7% C 0.173 H 269.4°. Best body text is #FFFFFF at 10.71:1 contrast (WCAG AA passes).

Color values

HEX	#21309B
RGB	rgb(33, 48, 155)
HSL	hsl(233, 65%, 37%)
HSV	hsv(233, 79%, 61%)
CMYK	cmyk(78.7%, 69%, 0%, 39.2%)
CIE-LAB	lab(26.17, 33.65, -59.62)
CIE-LCH	lch(26.17, 68.46, 299.44°)
OKLab	oklab(37.71% -0.0019 -0.1726)
OKLCH	oklch(37.71% 0.173 269.4)
XYZ	xyz(7.5985, 4.8029, 31.5306)
Luminance	0.0480 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#21309B #9B8C21

analogous

#216D9B #21309B #4F219B

triadic

#21309B #9B2130 #309B21

tetradic

#21309B #9B216D #9B8C21 #219B4F

square

#21309B #9B216D #9B8C21 #219B4F

split-complementary

#21309B #9B4F21 #6D9B21

monochromatic

#0C1136 #162069 #21309B #2C40CD #5A6ADC

Accessibility & contrast

On white

10.71

#21309B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#21309B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #21309B

10.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##21309B	#FFFFFF	#000000	##FFFFFF
##21309B	1.00	10.71	1.96	10.71
#FFFFFF	10.71	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00449E

Deuteranopia (green-blind)

#003899

Tritanopia (blue-blind)

#004D61

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #21309b;
/* rgb */ color: rgb(33, 48, 155);
/* oklch */ color: oklch(37.7% 0.173 269.4);

Tailwind

colors: {
  custom: {
    50: '#7268ba',
    500: '#21309b',
    950: '#000000',
  },
}

SCSS

$custom: #21309b;
$custom-light: #7268ba;
$custom-dark: #000000;

JSON

{
  "hex": "#21309b",
  "rgb": {
    "r": 33,
    "g": 48,
    "b": 155
  },
  "hsl": {
    "h": 232.623,
    "s": 64.894,
    "l": 36.863
  },
  "oklch": {
    "l": 0.37707,
    "c": 0.17261,
    "h": 269.4
  },
  "luminance": 0.04804
}

Semantic roles & 50–950 ramp

primary

#21309B

secondary

#C0B358

accent

#D340E8

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #21309B

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

Preview Lab → · Contrast checker → · Palette generator →