#637BF0#637BF0

#637BF0 is a light, vivid blue. Relative luminance 0.231; OKLCH L 62.3% C 0.177 H 271.7°. Best body text is #000000 at 5.62:1 contrast (WCAG AA passes).

Color values

HEX	#637BF0
RGB	rgb(99, 123, 240)
HSL	hsl(230, 82%, 66%)
HSV	hsv(230, 59%, 94%)
CMYK	cmyk(58.8%, 48.7%, 0%, 5.9%)
CIE-LAB	lab(55.18, 25.68, -61.72)
CIE-LCH	lch(55.18, 66.85, 292.59°)
OKLab	oklab(62.33% 0.0051 -0.1765)
OKLCH	oklch(62.33% 0.177 271.7)
XYZ	xyz(27.9515, 23.1076, 85.4084)
Luminance	0.2311 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BF0 #F0D863

analogous

#63C2F0 #637BF0 #9263F0

triadic

#637BF0 #F0637B #7BF063

tetradic

#637BF0 #F063C2 #F0D863 #63F092

square

#637BF0 #F063C2 #F0D863 #63F092

split-complementary

#637BF0 #F09263 #C2F063

monochromatic

#1331C6 #2B4CEB #637BF0 #9BAAF5 #D3D9FB

Accessibility & contrast

On white

3.74

#637BF0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.62

#637BF0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BF0

5.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BF0	#FFFFFF	#000000	##000000
##637BF0	1.00	3.74	5.62	5.62
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.62	21.00	1.00	1.00
##000000	5.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F8BF4

Deuteranopia (green-blind)

#247EEE

Tritanopia (blue-blind)

#0096AA

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #637bf0;
/* rgb */ color: rgb(99, 123, 240);
/* oklch */ color: oklch(62.3% 0.177 271.7);

Tailwind

colors: {
  custom: {
    50: '#9ba0f6',
    500: '#637bf0',
    950: '#000000',
  },
}

SCSS

$custom: #637bf0;
$custom-light: #9ba0f6;
$custom-dark: #000000;

JSON

{
  "hex": "#637bf0",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 240
  },
  "hsl": {
    "h": 229.787,
    "s": 82.456,
    "l": 66.471
  },
  "oklch": {
    "l": 0.62328,
    "c": 0.17656,
    "h": 271.7
  },
  "luminance": 0.2311
}

Semantic roles & 50–950 ramp

primary

#637BF0

secondary

#EEE6C1

accent

#BA07DF

background

#FAF9FF

surface

#F4F2FE

border

#CECCD6

text

#0F0E17

muted

#7F7E85

Preview Lab

Preview with #637BF0

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

Preview Lab → · Contrast checker → · Palette generator →