#638BCC#638BCC

#638BCC is a light, moderate blue. Relative luminance 0.255; OKLCH L 63.5% C 0.108 H 259.8°. Best body text is #000000 at 6.10:1 contrast (WCAG AA passes).

Color values

HEX	#638BCC
RGB	rgb(99, 139, 204)
HSL	hsl(217, 51%, 59%)
HSV	hsv(217, 51%, 80%)
CMYK	cmyk(51.5%, 31.9%, 0%, 20%)
CIE-LAB	lab(57.54, 4.56, -37.82)
CIE-LCH	lch(57.54, 38.09, 276.87°)
OKLab	oklab(63.51% -0.0192 -0.1064)
OKLCH	oklch(63.51% 0.108 259.8)
XYZ	xyz(25.2736, 25.4757, 60.7005)
Luminance	0.2548 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#638BCC #CCA463

analogous

#63C0CC #638BCC #7063CC

triadic

#638BCC #CC638B #8BCC63

tetradic

#638BCC #CC63C0 #CCA463 #63CC70

square

#638BCC #CC63C0 #CCA463 #63CC70

split-complementary

#638BCC #CC7063 #C0CC63

monochromatic

#2C4F88 #3C6AB6 #638BCC #91ADDB #BFD0EA

Accessibility & contrast

On white

3.45

#638BCC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.10

#638BCC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #638BCC

6.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##638BCC	#FFFFFF	#000000	##000000
##638BCC	1.00	3.45	6.10	6.10
#FFFFFF	3.45	1.00	21.00	21.00
#000000	6.10	21.00	1.00	1.00
##000000	6.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7290CF

Deuteranopia (green-blind)

#6586CB

Tritanopia (blue-blind)

#2F99A2

Achromatopsia (no color)

#8A8A8A

Design tokens & code

CSS

--color: #638bcc;
/* rgb */ color: rgb(99, 139, 204);
/* oklch */ color: oklch(63.5% 0.108 259.8);

Tailwind

colors: {
  custom: {
    50: '#95acdc',
    500: '#638bcc',
    950: '#000000',
  },
}

SCSS

$custom: #638bcc;
$custom-light: #95acdc;
$custom-dark: #000000;

JSON

{
  "hex": "#638bcc",
  "rgb": {
    "r": 99,
    "g": 139,
    "b": 204
  },
  "hsl": {
    "h": 217.143,
    "s": 50.725,
    "l": 59.412
  },
  "oklch": {
    "l": 0.63513,
    "c": 0.10811,
    "h": 259.8
  },
  "luminance": 0.25478
}

Semantic roles & 50–950 ramp

primary

#638BCC

secondary

#DACAB1

accent

#A54EDA

background

#F9FAFD

surface

#F2F4FB

border

#CCCED4

text

#0E1015

muted

#7E7F83

Preview Lab

Preview with #638BCC

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

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