#637CD3#637CD3

#637CD3 is a mid, vivid blue. Relative luminance 0.218; OKLCH L 60.7% C 0.135 H 269.9°. Best body text is #000000 at 5.35:1 contrast (WCAG AA passes).

Color values

HEX	#637CD3
RGB	rgb(99, 124, 211)
HSL	hsl(227, 56%, 61%)
HSV	hsv(227, 53%, 83%)
CMYK	cmyk(53.1%, 41.2%, 0%, 17.3%)
CIE-LAB	lab(53.78, 15.72, -47.70)
CIE-LCH	lch(53.78, 50.22, 288.24°)
OKLab	oklab(60.72% -0.0002 -0.1353)
OKLCH	oklch(60.72% 0.135 269.9)
XYZ	xyz(24.1073, 21.7694, 64.5470)
Luminance	0.2177 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637CD3 #D3BA63

analogous

#63B4D3 #637CD3 #8263D3

triadic

#637CD3 #D3637C #7CD363

tetradic

#637CD3 #D363B4 #D3BA63 #63D382

square

#637CD3 #D363B4 #D3BA63 #63D382

split-complementary

#637CD3 #D38263 #B4D363

monochromatic

#294192 #3756C2 #637CD3 #93A4E0 #C2CCEE

Accessibility & contrast

On white

3.92

#637CD3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.35

#637CD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637CD3

5.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637CD3	#FFFFFF	#000000	##000000
##637CD3	1.00	3.92	5.35	5.35
#FFFFFF	3.92	1.00	21.00	21.00
#000000	5.35	21.00	1.00	1.00
##000000	5.35	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5886D6

Deuteranopia (green-blind)

#4B7CD1

Tritanopia (blue-blind)

#2C8F9D

Achromatopsia (no color)

#818181

Design tokens & code

CSS

--color: #637cd3;
/* rgb */ color: rgb(99, 124, 211);
/* oklch */ color: oklch(60.7% 0.135 269.9);

Tailwind

colors: {
  custom: {
    50: '#97a1e1',
    500: '#637cd3',
    950: '#000000',
  },
}

SCSS

$custom: #637cd3;
$custom-light: #97a1e1;
$custom-dark: #000000;

JSON

{
  "hex": "#637cd3",
  "rgb": {
    "r": 99,
    "g": 124,
    "b": 211
  },
  "hsl": {
    "h": 226.607,
    "s": 56,
    "l": 60.784
  },
  "oklch": {
    "l": 0.60721,
    "c": 0.13531,
    "h": 269.9
  },
  "luminance": 0.21771
}

Semantic roles & 50–950 ramp

primary

#637CD3

secondary

#DED5B4

accent

#9F22C4

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0E15

muted

#7E7E83

Preview Lab

Preview with #637CD3

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

Preview Lab → · Contrast checker → · Palette generator →