#637BB2#637BB2

#637BB2 is a mid, moderate blue. Relative luminance 0.200; OKLCH L 58.7% C 0.089 H 265.7°. Best body text is #000000 at 5.01:1 contrast (WCAG AA passes).

Color values

HEX	#637BB2
RGB	rgb(99, 123, 178)
HSL	hsl(222, 34%, 54%)
HSV	hsv(222, 44%, 70%)
CMYK	cmyk(44.4%, 30.9%, 0%, 30.2%)
CIE-LAB	lab(51.87, 6.13, -31.85)
CIE-LCH	lch(51.87, 32.44, 280.89°)
OKLab	oklab(58.71% -0.0067 -0.0892)
OKLCH	oklch(58.71% 0.089 265.7)
XYZ	xyz(20.2619, 20.0318, 44.9097)
Luminance	0.2003 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BB2 #B29A63

analogous

#63A3B2 #637BB2 #7363B2

triadic

#637BB2 #B2637B #7BB263

tetradic

#637BB2 #B263A3 #B29A63 #63B273

square

#637BB2 #B263A3 #B29A63 #63B273

split-complementary

#637BB2 #B27363 #A3B263

monochromatic

#334368 #475E90 #637BB2 #8C9EC6 #B5C0DA

Accessibility & contrast

On white

4.19

#637BB2 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.01

#637BB2 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BB2

5.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BB2	#FFFFFF	#000000	##000000
##637BB2	1.00	4.19	5.01	5.01
#FFFFFF	4.19	1.00	21.00	21.00
#000000	5.01	21.00	1.00	1.00
##000000	5.01	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6780B4

Deuteranopia (green-blind)

#5F78B1

Tritanopia (blue-blind)

#46868F

Achromatopsia (no color)

#7C7C7C

Design tokens & code

CSS

--color: #637bb2;
/* rgb */ color: rgb(99, 123, 178);
/* oklch */ color: oklch(58.7% 0.089 265.7);

Tailwind

colors: {
  custom: {
    50: '#93a1c9',
    500: '#637bb2',
    950: '#000000',
  },
}

SCSS

$custom: #637bb2;
$custom-light: #93a1c9;
$custom-dark: #000000;

JSON

{
  "hex": "#637bb2",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 178
  },
  "hsl": {
    "h": 221.772,
    "s": 33.906,
    "l": 54.314
  },
  "oklch": {
    "l": 0.58712,
    "c": 0.08944,
    "h": 265.7
  },
  "luminance": 0.20033
}

Semantic roles & 50–950 ramp

primary

#637BB2

secondary

#C9BFA8

accent

#A95ECA

background

#F9F9FC

surface

#F2F2F8

border

#CCCCD1

text

#0D0E13

muted

#7E7E82

Preview Lab

Preview with #637BB2

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

Preview Lab → · Contrast checker → · Palette generator →