#637CEC#637CEC

#637CEC is a light, vivid blue. Relative luminance 0.231; OKLCH L 62.3% C 0.170 H 271.2°. Best body text is #000000 at 5.62:1 contrast (WCAG AA passes).

Color values

HEX	#637CEC
RGB	rgb(99, 124, 236)
HSL	hsl(229, 78%, 66%)
HSV	hsv(229, 58%, 93%)
CMYK	cmyk(58.1%, 47.5%, 0%, 7.5%)
CIE-LAB	lab(55.20, 23.77, -59.47)
CIE-LCH	lch(55.20, 64.04, 291.78°)
OKLab	oklab(62.26% 0.0037 -0.1699)
OKLCH	oklch(62.26% 0.17 271.2)
XYZ	xyz(27.4885, 23.1219, 82.3550)
Luminance	0.2312 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637CEC #ECD363

analogous

#63C0EC #637CEC #8E63EC

triadic

#637CEC #EC637C #7CEC63

tetradic

#637CEC #EC63C0 #ECD363 #63EC8E

square

#637CEC #EC63C0 #ECD363 #63EC8E

split-complementary

#637CEC #EC8E63 #C0EC63

monochromatic

#1735BE #2C4EE5 #637CEC #9AAAF3 #D0D8F9

Accessibility & contrast

On white

3.73

#637CEC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.62

#637CEC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637CEC

5.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637CEC	#FFFFFF	#000000	##000000
##637CEC	1.00	3.73	5.62	5.62
#FFFFFF	3.73	1.00	21.00	21.00
#000000	5.62	21.00	1.00	1.00
##000000	5.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#458AF0

Deuteranopia (green-blind)

#2F7EEA

Tritanopia (blue-blind)

#0095A9

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #637cec;
/* rgb */ color: rgb(99, 124, 236);
/* oklch */ color: oklch(62.3% 0.170 271.2);

Tailwind

colors: {
  custom: {
    50: '#9aa1f3',
    500: '#637cec',
    950: '#000000',
  },
}

SCSS

$custom: #637cec;
$custom-light: #9aa1f3;
$custom-dark: #000000;

JSON

{
  "hex": "#637cec",
  "rgb": {
    "r": 99,
    "g": 124,
    "b": 236
  },
  "hsl": {
    "h": 229.051,
    "s": 78.286,
    "l": 65.686
  },
  "oklch": {
    "l": 0.62261,
    "c": 0.1699,
    "h": 271.2
  },
  "luminance": 0.23124
}

Semantic roles & 50–950 ramp

primary

#637CEC

secondary

#ECE4BF

accent

#B50BDB

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0E17

muted

#7F7E85

Preview Lab

Preview with #637CEC

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

Preview Lab → · Contrast checker → · Palette generator →