#637EEB#637EEB

#637EEB is a light, vivid blue. Relative luminance 0.236; OKLCH L 62.6% C 0.166 H 270.5°. Best body text is #000000 at 5.71:1 contrast (WCAG AA passes).

Color values

HEX	#637EEB
RGB	rgb(99, 126, 235)
HSL	hsl(228, 77%, 65%)
HSV	hsv(228, 58%, 92%)
CMYK	cmyk(57.9%, 46.4%, 0%, 7.8%)
CIE-LAB	lab(55.66, 22.23, -58.18)
CIE-LCH	lch(55.66, 62.28, 290.91°)
OKLab	oklab(62.59% 0.0015 -0.166)
OKLCH	oklch(62.59% 0.166 270.5)
XYZ	xyz(27.5969, 23.5704, 81.6764)
Luminance	0.2357 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637EEB #EBD063

analogous

#63C2EB #637EEB #8C63EB

triadic

#637EEB #EB637E #7EEB63

tetradic

#637EEB #EB63C2 #EBD063 #63EB8C

square

#637EEB #EB63C2 #EBD063 #63EB8C

split-complementary

#637EEB #EB8C63 #C2EB63

monochromatic

#1839BC #2D51E4 #637EEB #99ABF2 #CFD8F9

Accessibility & contrast

On white

3.67

#637EEB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.71

#637EEB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637EEB

5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637EEB	#FFFFFF	#000000	##000000
##637EEB	1.00	3.67	5.71	5.71
#FFFFFF	3.67	1.00	21.00	21.00
#000000	5.71	21.00	1.00	1.00
##000000	5.71	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A8CEF

Deuteranopia (green-blind)

#3580E9

Tritanopia (blue-blind)

#0096A9

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #637eeb;
/* rgb */ color: rgb(99, 126, 235);
/* oklch */ color: oklch(62.6% 0.166 270.5);

Tailwind

colors: {
  custom: {
    50: '#9aa3f2',
    500: '#637eeb',
    950: '#000000',
  },
}

SCSS

$custom: #637eeb;
$custom-light: #9aa3f2;
$custom-dark: #000000;

JSON

{
  "hex": "#637eeb",
  "rgb": {
    "r": 99,
    "g": 126,
    "b": 235
  },
  "hsl": {
    "h": 228.088,
    "s": 77.273,
    "l": 65.49
  },
  "oklch": {
    "l": 0.6259,
    "c": 0.16606,
    "h": 270.5
  },
  "luminance": 0.23573
}

Semantic roles & 50–950 ramp

primary

#637EEB

secondary

#ECE3BE

accent

#B10CDA

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0F17

muted

#7F7E85

Preview Lab

Preview with #637EEB

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

Preview Lab → · Contrast checker → · Palette generator →