#637EE9#637EE9

#637EE9 is a light, vivid blue. Relative luminance 0.235; OKLCH L 62.5% C 0.163 H 270.4°. Best body text is #000000 at 5.69:1 contrast (WCAG AA passes).

Color values

HEX	#637EE9
RGB	rgb(99, 126, 233)
HSL	hsl(228, 75%, 65%)
HSV	hsv(228, 58%, 91%)
CMYK	cmyk(57.5%, 45.9%, 0%, 8.6%)
CIE-LAB	lab(55.54, 21.58, -57.25)
CIE-LCH	lch(55.54, 61.18, 290.65°)
OKLab	oklab(62.46% 0.0012 -0.1633)
OKLCH	oklch(62.46% 0.163 270.4)
XYZ	xyz(27.3095, 23.4554, 80.1632)
Luminance	0.2346 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637EE9 #E9CE63

analogous

#63C1E9 #637EE9 #8B63E9

triadic

#637EE9 #E9637E #7EE963

tetradic

#637EE9 #E963C1 #E9CE63 #63E98B

square

#637EE9 #E963C1 #E9CE63 #63E98B

split-complementary

#637EE9 #E98B63 #C1E963

monochromatic

#1A3AB8 #2D52E1 #637EE9 #99AAF1 #CED7F8

Accessibility & contrast

On white

3.69

#637EE9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.69

#637EE9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637EE9

5.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637EE9	#FFFFFF	#000000	##000000
##637EE9	1.00	3.69	5.69	5.69
#FFFFFF	3.69	1.00	21.00	21.00
#000000	5.69	21.00	1.00	1.00
##000000	5.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C8BED

Deuteranopia (green-blind)

#387FE7

Tritanopia (blue-blind)

#0096A8

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #637ee9;
/* rgb */ color: rgb(99, 126, 233);
/* oklch */ color: oklch(62.5% 0.163 270.4);

Tailwind

colors: {
  custom: {
    50: '#99a3f1',
    500: '#637ee9',
    950: '#000000',
  },
}

SCSS

$custom: #637ee9;
$custom-light: #99a3f1;
$custom-dark: #000000;

JSON

{
  "hex": "#637ee9",
  "rgb": {
    "r": 99,
    "g": 126,
    "b": 233
  },
  "hsl": {
    "h": 227.91,
    "s": 75.281,
    "l": 65.098
  },
  "oklch": {
    "l": 0.62464,
    "c": 0.16332,
    "h": 270.4
  },
  "luminance": 0.23458
}

Semantic roles & 50–950 ramp

primary

#637EE9

secondary

#EBE1BD

accent

#AF0ED7

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0F17

muted

#7F7E85

Preview Lab

Preview with #637EE9

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

Preview Lab → · Contrast checker → · Palette generator →