#637FEB#637FEB

#637FEB is a light, vivid blue. Relative luminance 0.238; OKLCH L 62.8% C 0.165 H 270.2°. Best body text is #000000 at 5.77:1 contrast (WCAG AA passes).

Color values

HEX	#637FEB
RGB	rgb(99, 127, 235)
HSL	hsl(228, 77%, 65%)
HSV	hsv(228, 58%, 92%)
CMYK	cmyk(57.9%, 46%, 0%, 7.8%)
CIE-LAB	lab(55.91, 21.62, -57.76)
CIE-LCH	lch(55.91, 61.68, 290.52°)
OKLab	oklab(62.79% 0.0005 -0.1648)
OKLCH	oklch(62.79% 0.165 270.2)
XYZ	xyz(27.7254, 23.8274, 81.7193)
Luminance	0.2383 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FEB #EBCF63

analogous

#63C3EB #637FEB #8B63EB

triadic

#637FEB #EB637F #7FEB63

tetradic

#637FEB #EB63C3 #EBCF63 #63EB8B

square

#637FEB #EB63C3 #EBCF63 #63EB8B

split-complementary

#637FEB #EB8B63 #C3EB63

monochromatic

#183ABC #2D52E4 #637FEB #99ACF2 #CFD8F9

Accessibility & contrast

On white

3.64

#637FEB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.77

#637FEB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FEB

5.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FEB	#FFFFFF	#000000	##000000
##637FEB	1.00	3.64	5.77	5.77
#FFFFFF	3.64	1.00	21.00	21.00
#000000	5.77	21.00	1.00	1.00
##000000	5.77	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C8CEF

Deuteranopia (green-blind)

#3880E9

Tritanopia (blue-blind)

#0097AA

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #637feb;
/* rgb */ color: rgb(99, 127, 235);
/* oklch */ color: oklch(62.8% 0.165 270.2);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#637feb",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 235
  },
  "hsl": {
    "h": 227.647,
    "s": 77.273,
    "l": 65.49
  },
  "oklch": {
    "l": 0.62788,
    "c": 0.16481,
    "h": 270.2
  },
  "luminance": 0.2383
}

Semantic roles & 50–950 ramp

primary

#637FEB

secondary

#ECE2BE

accent

#AF0CDA

background

#FAFAFE

surface

#F3F3FD

border

#CDCDD5

text

#0F0F17

muted

#7F7F85

Preview Lab

Preview with #637FEB

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

Preview Lab → · Contrast checker → · Palette generator →