#637FF0#637FF0

#637FF0 is a light, vivid blue. Relative luminance 0.241; OKLCH L 63.1% C 0.172 H 270.4°. Best body text is #000000 at 5.82:1 contrast (WCAG AA passes).

Color values

HEX	#637FF0
RGB	rgb(99, 127, 240)
HSL	hsl(228, 82%, 66%)
HSV	hsv(228, 59%, 94%)
CMYK	cmyk(58.8%, 47.1%, 0%, 5.9%)
CIE-LAB	lab(56.21, 23.25, -60.07)
CIE-LCH	lch(56.21, 64.42, 291.16°)
OKLab	oklab(63.11% 0.0011 -0.1716)
OKLCH	oklch(63.11% 0.172 270.4)
XYZ	xyz(28.4579, 24.1204, 85.5772)
Luminance	0.2412 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FF0 #F0D463

analogous

#63C6F0 #637FF0 #8E63F0

triadic

#637FF0 #F0637F #7FF063

tetradic

#637FF0 #F063C6 #F0D463 #63F08E

square

#637FF0 #F063C6 #F0D463 #63F08E

split-complementary

#637FF0 #F08E63 #C6F063

monochromatic

#1336C6 #2B51EB #637FF0 #9BADF5 #D3DBFB

Accessibility & contrast

On white

3.61

#637FF0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.82

#637FF0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FF0

5.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FF0	#FFFFFF	#000000	##000000
##637FF0	1.00	3.61	5.82	5.82
#FFFFFF	3.61	1.00	21.00	21.00
#000000	5.82	21.00	1.00	1.00
##000000	5.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#478DF4

Deuteranopia (green-blind)

#3081EE

Tritanopia (blue-blind)

#0099AC

Achromatopsia (no color)

#878787

Design tokens & code

CSS

--color: #637ff0;
/* rgb */ color: rgb(99, 127, 240);
/* oklch */ color: oklch(63.1% 0.172 270.4);

Tailwind

colors: {
  custom: {
    50: '#9aa3f5',
    500: '#637ff0',
    950: '#000000',
  },
}

SCSS

$custom: #637ff0;
$custom-light: #9aa3f5;
$custom-dark: #000000;

JSON

{
  "hex": "#637ff0",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 240
  },
  "hsl": {
    "h": 228.085,
    "s": 82.456,
    "l": 66.471
  },
  "oklch": {
    "l": 0.63106,
    "c": 0.17161,
    "h": 270.4
  },
  "luminance": 0.24123
}

Semantic roles & 50–950 ramp

primary

#637FF0

secondary

#EEE5C1

accent

#B407DF

background

#FAFAFF

surface

#F4F3FE

border

#CECDD6

text

#0F0F17

muted

#7F7F85

Preview Lab

Preview with #637FF0

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

Preview Lab → · Contrast checker → · Palette generator →