#637DFF#637DFF

#637DFF is a light, vivid blue. Relative luminance 0.245; OKLCH L 63.7% C 0.194 H 271.4°. Best body text is #000000 at 5.91:1 contrast (WCAG AA passes).

Color values

HEX	#637DFF
RGB	rgb(99, 125, 255)
HSL	hsl(230, 100%, 69%)
HSV	hsv(230, 61%, 100%)
CMYK	cmyk(61.2%, 51%, 0%, 0%)
CIE-LAB	lab(56.62, 29.38, -67.70)
CIE-LCH	lch(56.62, 73.80, 293.45°)
OKLab	oklab(63.72% 0.0046 -0.1941)
OKLCH	oklch(63.72% 0.194 271.4)
XYZ	xyz(30.5232, 24.5373, 97.7160)
Luminance	0.2454 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637DFF #FFE563

analogous

#63CBFF #637DFF #9763FF

triadic

#637DFF #FF637D #7DFF63

tetradic

#637DFF #FF63CB #FFE563 #63FF97

square

#637DFF #FF63CB #FFE563 #63FF97

split-complementary

#637DFF #FF9763 #CBFF63

monochromatic

#0027E8 #264AFF #637DFF #A0B0FF #DDE3FF

Accessibility & contrast

On white

3.55

#637DFF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.91

#637DFF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637DFF

5.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637DFF	#FFFFFF	#000000	##000000
##637DFF	1.00	3.55	5.91	5.91
#FFFFFF	3.55	1.00	21.00	21.00
#000000	5.91	21.00	1.00	1.00
##000000	5.91	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#308FFF

Deuteranopia (green-blind)

#0081FC

Tritanopia (blue-blind)

#009BB2

Achromatopsia (no color)

#888888

Design tokens & code

CSS

--color: #637dff;
/* rgb */ color: rgb(99, 125, 255);
/* oklch */ color: oklch(63.7% 0.194 271.4);

Tailwind

colors: {
  custom: {
    50: '#9da2ff',
    500: '#637dff',
    950: '#000000',
  },
}

SCSS

$custom: #637dff;
$custom-light: #9da2ff;
$custom-dark: #000000;

JSON

{
  "hex": "#637dff",
  "rgb": {
    "r": 99,
    "g": 125,
    "b": 255
  },
  "hsl": {
    "h": 230,
    "s": 100,
    "l": 69.412
  },
  "oklch": {
    "l": 0.63715,
    "c": 0.19412,
    "h": 271.4
  },
  "luminance": 0.2454
}

Semantic roles & 50–950 ramp

primary

#637DFF

secondary

#F5EEC8

accent

#BF00E6

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#100F18

muted

#7F7E86

Preview Lab

Preview with #637DFF

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

Preview Lab → · Contrast checker → · Palette generator →