#637BEF#637BEF

#637BEF is a light, vivid blue. Relative luminance 0.231; OKLCH L 62.3% C 0.175 H 271.6°. Best body text is #000000 at 5.61:1 contrast (WCAG AA passes).

Color values

HEX	#637BEF
RGB	rgb(99, 123, 239)
HSL	hsl(230, 81%, 66%)
HSV	hsv(230, 59%, 94%)
CMYK	cmyk(58.6%, 48.5%, 0%, 6.3%)
CIE-LAB	lab(55.12, 25.35, -61.26)
CIE-LCH	lch(55.12, 66.30, 292.48°)
OKLab	oklab(62.26% 0.005 -0.1751)
OKLCH	oklch(62.26% 0.175 271.6)
XYZ	xyz(27.8034, 23.0484, 84.6282)
Luminance	0.2305 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BEF #EFD763

analogous

#63C1EF #637BEF #9163EF

triadic

#637BEF #EF637B #7BEF63

tetradic

#637BEF #EF63C1 #EFD763 #63EF91

square

#637BEF #EF63C1 #EFD763 #63EF91

split-complementary

#637BEF #EF9163 #C1EF63

monochromatic

#1432C4 #2B4CE9 #637BEF #9BAAF5 #D2D9FA

Accessibility & contrast

On white

3.74

#637BEF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.61

#637BEF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BEF

5.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BEF	#FFFFFF	#000000	##000000
##637BEF	1.00	3.74	5.61	5.61
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.61	21.00	1.00	1.00
##000000	5.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#408AF3

Deuteranopia (green-blind)

#267EED

Tritanopia (blue-blind)

#0095AA

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #637bef;
/* rgb */ color: rgb(99, 123, 239);
/* oklch */ color: oklch(62.3% 0.175 271.6);

Tailwind

colors: {
  custom: {
    50: '#9aa0f5',
    500: '#637bef',
    950: '#000000',
  },
}

SCSS

$custom: #637bef;
$custom-light: #9aa0f5;
$custom-dark: #000000;

JSON

{
  "hex": "#637bef",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 239
  },
  "hsl": {
    "h": 229.714,
    "s": 81.395,
    "l": 66.275
  },
  "oklch": {
    "l": 0.62262,
    "c": 0.17521,
    "h": 271.6
  },
  "luminance": 0.23051
}

Semantic roles & 50–950 ramp

primary

#637BEF

secondary

#EEE6C0

accent

#B908DE

background

#FAF9FF

surface

#F4F2FE

border

#CECCD6

text

#0F0E17

muted

#7F7E85

Preview Lab

Preview with #637BEF

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

Preview Lab → · Contrast checker → · Palette generator →