#637EEF#637EEF

#637EEF is a light, vivid blue. Relative luminance 0.238; OKLCH L 62.8% C 0.171 H 270.7°. Best body text is #000000 at 5.76:1 contrast (WCAG AA passes).

Color values

HEX	#637EEF
RGB	rgb(99, 126, 239)
HSL	hsl(228, 81%, 66%)
HSV	hsv(228, 59%, 94%)
CMYK	cmyk(58.6%, 47.3%, 0%, 6.3%)
CIE-LAB	lab(55.89, 23.53, -60.03)
CIE-LCH	lch(55.89, 64.48, 291.41°)
OKLab	oklab(62.85% 0.002 -0.1715)
OKLCH	oklch(62.85% 0.171 270.7)
XYZ	xyz(28.1812, 23.8041, 84.7542)
Luminance	0.2381 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637EEF #EFD463

analogous

#63C4EF #637EEF #8E63EF

triadic

#637EEF #EF637E #7EEF63

tetradic

#637EEF #EF63C4 #EFD463 #63EF8E

square

#637EEF #EF63C4 #EFD463 #63EF8E

split-complementary

#637EEF #EF8E63 #C4EF63

monochromatic

#1436C4 #2B50E9 #637EEF #9BACF5 #D2DAFA

Accessibility & contrast

On white

3.65

#637EEF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.76

#637EEF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637EEF

5.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637EEF	#FFFFFF	#000000	##000000
##637EEF	1.00	3.65	5.76	5.76
#FFFFFF	3.65	1.00	21.00	21.00
#000000	5.76	21.00	1.00	1.00
##000000	5.76	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#468CF3

Deuteranopia (green-blind)

#2F80ED

Tritanopia (blue-blind)

#0098AB

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #637eef;
/* rgb */ color: rgb(99, 126, 239);
/* oklch */ color: oklch(62.8% 0.171 270.7);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#637eef",
  "rgb": {
    "r": 99,
    "g": 126,
    "b": 239
  },
  "hsl": {
    "h": 228.429,
    "s": 81.395,
    "l": 66.275
  },
  "oklch": {
    "l": 0.62846,
    "c": 0.17149,
    "h": 270.7
  },
  "luminance": 0.23806
}

Semantic roles & 50–950 ramp

primary

#637EEF

secondary

#EEE5C0

accent

#B408DE

background

#FAF9FF

surface

#F3F2FE

border

#CDCCD6

text

#0F0F17

muted

#7F7E85

Preview Lab

Preview with #637EEF

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

Preview Lab → · Contrast checker → · Palette generator →