#637FD3#637FD3

#637FD3 is a mid, vivid blue. Relative luminance 0.225; OKLCH L 61.3% C 0.132 H 268.4°. Best body text is #000000 at 5.51:1 contrast (WCAG AA passes).

Color values

HEX	#637FD3
RGB	rgb(99, 127, 211)
HSL	hsl(225, 56%, 61%)
HSV	hsv(225, 53%, 83%)
CMYK	cmyk(53.1%, 39.8%, 0%, 17.3%)
CIE-LAB	lab(54.59, 13.90, -46.42)
CIE-LCH	lch(54.59, 48.45, 286.67°)
OKLab	oklab(61.34% -0.0036 -0.1315)
OKLCH	oklch(61.34% 0.132 268.4)
XYZ	xyz(24.4890, 22.5328, 64.6742)
Luminance	0.2253 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FD3 #D3B763

analogous

#63B7D3 #637FD3 #7F63D3

triadic

#637FD3 #D3637F #7FD363

tetradic

#637FD3 #D363B7 #D3B763 #63D37F

square

#637FD3 #D363B7 #D3B763 #63D37F

split-complementary

#637FD3 #D37F63 #B7D363

monochromatic

#294492 #375AC2 #637FD3 #93A6E0 #C2CDEE

Accessibility & contrast

On white

3.81

#637FD3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.51

#637FD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FD3

5.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FD3	#FFFFFF	#000000	##000000
##637FD3	1.00	3.81	5.51	5.51
#FFFFFF	3.81	1.00	21.00	21.00
#000000	5.51	21.00	1.00	1.00
##000000	5.51	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D88D6

Deuteranopia (green-blind)

#507ED1

Tritanopia (blue-blind)

#2B919F

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #637fd3;
/* rgb */ color: rgb(99, 127, 211);
/* oklch */ color: oklch(61.3% 0.132 268.4);

Tailwind

colors: {
  custom: {
    50: '#96a3e1',
    500: '#637fd3',
    950: '#000000',
  },
}

SCSS

$custom: #637fd3;
$custom-light: #96a3e1;
$custom-dark: #000000;

JSON

{
  "hex": "#637fd3",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 211
  },
  "hsl": {
    "h": 225,
    "s": 56,
    "l": 60.784
  },
  "oklch": {
    "l": 0.61341,
    "c": 0.13159,
    "h": 268.4
  },
  "luminance": 0.22535
}

Semantic roles & 50–950 ramp

primary

#637FD3

secondary

#DED4B4

accent

#9B22C4

background

#F9FAFD

surface

#F2F3FB

border

#CCCDD4

text

#0E0F15

muted

#7E7F83

Preview Lab

Preview with #637FD3

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

Preview Lab → · Contrast checker → · Palette generator →