#637D99#637D99

#637D99 is a mid, muted cyan. Relative luminance 0.196; OKLCH L 58.0% C 0.053 H 250.6°. Best body text is #000000 at 4.92:1 contrast (WCAG AA passes).

Color values

HEX	#637D99
RGB	rgb(99, 125, 153)
HSL	hsl(211, 21%, 49%)
HSV	hsv(211, 35%, 60%)
CMYK	cmyk(35.3%, 18.3%, 0%, 40%)
CIE-LAB	lab(51.40, -2.20, -18.07)
CIE-LCH	lch(51.40, 18.20, 263.07°)
OKLab	oklab(58% -0.0175 -0.0498)
OKLCH	oklch(58% 0.053 250.6)
XYZ	xyz(18.2272, 19.6189, 32.9572)
Luminance	0.1962 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637D99 #997F63

analogous

#639899 #637D99 #646399

triadic

#637D99 #99637D #7D9963

tetradic

#637D99 #996398 #997F63 #639964

square

#637D99 #996398 #997F63 #639964

split-complementary

#637D99 #996463 #989963

monochromatic

#33404F #4B5F74 #637D99 #889CB2 #ADBBCA

Accessibility & contrast

On white

4.26

#637D99 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.92

#637D99 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637D99

4.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637D99	#FFFFFF	#000000	##000000
##637D99	1.00	4.26	4.92	4.92
#FFFFFF	4.26	1.00	21.00	21.00
#000000	4.92	21.00	1.00	1.00
##000000	4.92	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#727E9A

Deuteranopia (green-blind)

#6C7898

Tritanopia (blue-blind)

#528386

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #637d99;
/* rgb */ color: rgb(99, 125, 153);
/* oklch */ color: oklch(58.0% 0.053 250.6);

Tailwind

colors: {
  custom: {
    50: '#91a2b7',
    500: '#637d99',
    950: '#000000',
  },
}

SCSS

$custom: #637d99;
$custom-light: #91a2b7;
$custom-dark: #000000;

JSON

{
  "hex": "#637d99",
  "rgb": {
    "r": 99,
    "g": 125,
    "b": 153
  },
  "hsl": {
    "h": 211.111,
    "s": 21.429,
    "l": 49.412
  },
  "oklch": {
    "l": 0.58002,
    "c": 0.0528,
    "h": 250.6
  },
  "luminance": 0.1962
}

Semantic roles & 50–950 ramp

primary

#637D99

secondary

#B8AC9F

accent

#956ABE

background

#F9F9FB

surface

#F1F2F6

border

#CBCCD0

text

#0D0F11

muted

#7E7E80

Preview Lab

Preview with #637D99

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

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