#637FBB#637FBB

#637FBB is a mid, moderate blue. Relative luminance 0.214; OKLCH L 60.0% C 0.098 H 264.5°. Best body text is #000000 at 5.28:1 contrast (WCAG AA passes).

Color values

HEX	#637FBB
RGB	rgb(99, 127, 187)
HSL	hsl(221, 39%, 56%)
HSV	hsv(221, 47%, 73%)
CMYK	cmyk(47.1%, 32.1%, 0%, 26.7%)
CIE-LAB	lab(53.40, 6.45, -34.63)
CIE-LCH	lch(53.40, 35.23, 280.54°)
OKLab	oklab(60.04% -0.0093 -0.0972)
OKLCH	oklch(60.04% 0.098 264.5)
XYZ	xyz(21.7017, 21.4179, 49.9946)
Luminance	0.2142 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FBB #BB9F63

analogous

#63ABBB #637FBB #7363BB

triadic

#637FBB #BB637F #7FBB63

tetradic

#637FBB #BB63AB #BB9F63 #63BB73

square

#637FBB #BB63AB #BB9F63 #63BB73

split-complementary

#637FBB #BB7363 #ABBB63

monochromatic

#324672 #44609D #637FBB #8EA2CE #B8C5E0

Accessibility & contrast

On white

3.97

#637FBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.28

#637FBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FBB

5.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FBB	#FFFFFF	#000000	##000000
##637FBB	1.00	3.97	5.28	5.28
#FFFFFF	3.97	1.00	21.00	21.00
#000000	5.28	21.00	1.00	1.00
##000000	5.28	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6984BE

Deuteranopia (green-blind)

#5F7CBA

Tritanopia (blue-blind)

#408C95

Achromatopsia (no color)

#808080

Design tokens & code

CSS

--color: #637fbb;
/* rgb */ color: rgb(99, 127, 187);
/* oklch */ color: oklch(60.0% 0.098 264.5);

Tailwind

colors: {
  custom: {
    50: '#94a3cf',
    500: '#637fbb',
    950: '#000000',
  },
}

SCSS

$custom: #637fbb;
$custom-light: #94a3cf;
$custom-dark: #000000;

JSON

{
  "hex": "#637fbb",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 187
  },
  "hsl": {
    "h": 220.909,
    "s": 39.286,
    "l": 56.078
  },
  "oklch": {
    "l": 0.60038,
    "c": 0.09766,
    "h": 264.5
  },
  "luminance": 0.21419
}

Semantic roles & 50–950 ramp

primary

#637FBB

secondary

#CFC4AB

accent

#A959CF

background

#F9FAFC

surface

#F2F3F9

border

#CCCDD2

text

#0D0F14

muted

#7E7F82

Preview Lab

Preview with #637FBB

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

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