#637FEE#637FEE

#637FEE is a light, vivid blue. Relative luminance 0.240; OKLCH L 63.0% C 0.169 H 270.3°. Best body text is #000000 at 5.80:1 contrast (WCAG AA passes).

Color values

HEX	#637FEE
RGB	rgb(99, 127, 238)
HSL	hsl(228, 80%, 66%)
HSV	hsv(228, 58%, 93%)
CMYK	cmyk(58.4%, 46.6%, 0%, 6.7%)
CIE-LAB	lab(56.09, 22.60, -59.15)
CIE-LCH	lch(56.09, 63.32, 290.91°)
OKLab	oklab(62.98% 0.0009 -0.1689)
OKLCH	oklch(62.98% 0.169 270.3)
XYZ	xyz(28.1624, 24.0022, 84.0212)
Luminance	0.2400 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637FEE #EED263

analogous

#63C4EE #637FEE #8C63EE

triadic

#637FEE #EE637F #7FEE63

tetradic

#637FEE #EE63C4 #EED263 #63EE8C

square

#637FEE #EE63C4 #EED263 #63EE8C

split-complementary

#637FEE #EE8C63 #C4EE63

monochromatic

#1538C2 #2C52E8 #637FEE #9AACF4 #D1DAFA

Accessibility & contrast

On white

3.62

#637FEE on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.80

#637FEE on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637FEE

5.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637FEE	#FFFFFF	#000000	##000000
##637FEE	1.00	3.62	5.80	5.80
#FFFFFF	3.62	1.00	21.00	21.00
#000000	5.80	21.00	1.00	1.00
##000000	5.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#498DF2

Deuteranopia (green-blind)

#3381EC

Tritanopia (blue-blind)

#0098AB

Achromatopsia (no color)

#868686

Design tokens & code

CSS

--color: #637fee;
/* rgb */ color: rgb(99, 127, 238);
/* oklch */ color: oklch(63.0% 0.169 270.3);

Tailwind

colors: {
  custom: {
    50: '#9aa3f4',
    500: '#637fee',
    950: '#000000',
  },
}

SCSS

$custom: #637fee;
$custom-light: #9aa3f4;
$custom-dark: #000000;

JSON

{
  "hex": "#637fee",
  "rgb": {
    "r": 99,
    "g": 127,
    "b": 238
  },
  "hsl": {
    "h": 227.914,
    "s": 80.347,
    "l": 66.078
  },
  "oklch": {
    "l": 0.62978,
    "c": 0.1689,
    "h": 270.3
  },
  "luminance": 0.24004
}

Semantic roles & 50–950 ramp

primary

#637FEE

secondary

#EDE4C0

accent

#B209DD

background

#FAFAFF

surface

#F3F3FE

border

#CDCDD6

text

#0F0F17

muted

#7F7F85

Preview Lab

Preview with #637FEE

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

Preview Lab → · Contrast checker → · Palette generator →