#21307B#21307B

#21307B is a dark, vivid blue. Relative luminance 0.039; OKLCH L 34.6% C 0.128 H 269.8°. Best body text is #FFFFFF at 11.84:1 contrast (WCAG AA passes).

Color values

HEX	#21307B
RGB	rgb(33, 48, 123)
HSL	hsl(230, 58%, 31%)
HSV	hsv(230, 73%, 48%)
CMYK	cmyk(73.2%, 61%, 0%, 51.8%)
CIE-LAB	lab(23.23, 21.44, -44.53)
CIE-LCH	lch(23.23, 49.42, 295.71°)
OKLab	oklab(34.64% -0.0005 -0.1284)
OKLCH	oklch(34.64% 0.128 269.8)
XYZ	xyz(5.2581, 3.8668, 19.2043)
Luminance	0.0387 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#21307B #7B6C21

analogous

#215D7B #21307B #3F217B

triadic

#21307B #7B2130 #307B21

tetradic

#21307B #7B215D #7B6C21 #217B3F

square

#21307B #7B215D #7B6C21 #217B3F

split-complementary

#21307B #7B3F21 #5D7B21

monochromatic

#070A1A #141D4B #21307B #2E43AB #485FCE

Accessibility & contrast

On white

11.84

#21307B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#21307B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #21307B

11.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##21307B	#FFFFFF	#000000	##FFFFFF
##21307B	1.00	11.84	1.77	11.84
#FFFFFF	11.84	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C7E

Deuteranopia (green-blind)

#00337A

Tritanopia (blue-blind)

#004350

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #21307b;
/* rgb */ color: rgb(33, 48, 123);
/* oklch */ color: oklch(34.6% 0.128 269.8);

Tailwind

colors: {
  custom: {
    50: '#6968a2',
    500: '#21307b',
    950: '#000000',
  },
}

SCSS

$custom: #21307b;
$custom-light: #6968a2;
$custom-dark: #000000;

JSON

{
  "hex": "#21307b",
  "rgb": {
    "r": 33,
    "g": 48,
    "b": 123
  },
  "hsl": {
    "h": 230,
    "s": 57.692,
    "l": 30.588
  },
  "oklch": {
    "l": 0.34642,
    "c": 0.1284,
    "h": 269.8
  },
  "luminance": 0.03867
}

Semantic roles & 50–950 ramp

primary

#21307B

secondary

#AE9D4A

accent

#C747E1

background

#F6F6FA

surface

#ECEBF3

border

#C7C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #21307B

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

Preview Lab → · Contrast checker → · Palette generator →