#21577B#21577B

#21577B is a dark, moderate cyan. Relative luminance 0.086; OKLCH L 43.8% C 0.082 H 241.5°. Best body text is #FFFFFF at 7.74:1 contrast (WCAG AA passes).

Color values

HEX	#21577B
RGB	rgb(33, 87, 123)
HSL	hsl(204, 58%, 31%)
HSV	hsv(204, 73%, 48%)
CMYK	cmyk(73.2%, 29.3%, 0%, 51.8%)
CIE-LAB	lab(35.14, -4.94, -25.49)
CIE-LCH	lch(35.14, 25.97, 259.04°)
OKLab	oklab(43.84% -0.0391 -0.072)
OKLCH	oklch(43.84% 0.082 241.5)
XYZ	xyz(7.6092, 8.5689, 19.9880)
Luminance	0.0857 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#21577B #7B4521

analogous

#217B72 #21577B #212A7B

triadic

#21577B #7B2157 #577B21

tetradic

#21577B #72217B #7B4521 #2A7B21

square

#21577B #72217B #7B4521 #2A7B21

split-complementary

#21577B #7B212A #7B7221

monochromatic

#07131A #14354B #21577B #2E79AB #4899CE

Accessibility & contrast

On white

7.74

#21577B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.71

#21577B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #21577B

7.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##21577B	#FFFFFF	#000000	##FFFFFF
##21577B	1.00	7.74	2.71	7.74
#FFFFFF	7.74	1.00	21.00	1.00
#000000	2.71	21.00	1.00	21.00
##FFFFFF	7.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#46577D

Deuteranopia (green-blind)

#3A4F7A

Tritanopia (blue-blind)

#006064

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #21577b;
/* rgb */ color: rgb(33, 87, 123);
/* oklch */ color: oklch(43.8% 0.082 241.5);

Tailwind

colors: {
  custom: {
    50: '#6986a1',
    500: '#21577b',
    950: '#000000',
  },
}

SCSS

$custom: #21577b;
$custom-light: #6986a1;
$custom-dark: #000000;

JSON

{
  "hex": "#21577b",
  "rgb": {
    "r": 33,
    "g": 87,
    "b": 123
  },
  "hsl": {
    "h": 204,
    "s": 57.692,
    "l": 30.588
  },
  "oklch": {
    "l": 0.43836,
    "c": 0.08193,
    "h": 241.5
  },
  "luminance": 0.0857
}

Semantic roles & 50–950 ramp

primary

#21577B

secondary

#AE724A

accent

#8447E1

background

#F6F8F9

surface

#EBEFF2

border

#C6CACC

text

#070B0F

muted

#7A7C7E

Preview Lab

Preview with #21577B

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

Preview Lab → · Contrast checker → · Palette generator →