#637EC9#637EC9

#637EC9 is a mid, moderate blue. Relative luminance 0.218; OKLCH L 60.6% C 0.119 H 267.8°. Best body text is #000000 at 5.36:1 contrast (WCAG AA passes).

Color values

HEX	#637EC9
RGB	rgb(99, 126, 201)
HSL	hsl(224, 49%, 59%)
HSV	hsv(224, 51%, 79%)
CMYK	cmyk(50.7%, 37.3%, 0%, 21.2%)
CIE-LAB	lab(53.80, 11.36, -41.99)
CIE-LCH	lch(53.80, 43.50, 285.13°)
OKLab	oklab(60.57% -0.0046 -0.1186)
OKLCH	oklch(60.57% 0.119 267.8)
XYZ	xyz(23.1456, 21.7899, 58.2332)
Luminance	0.2179 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637EC9 #C9AE63

analogous

#63B1C9 #637EC9 #7B63C9

triadic

#637EC9 #C9637E #7EC963

tetradic

#637EC9 #C963B1 #C9AE63 #63C97B

square

#637EC9 #C963B1 #C9AE63 #63C97B

split-complementary

#637EC9 #C97B63 #B1C963

monochromatic

#2E4584 #3D5CB1 #637EC9 #90A4D9 #BEC9E8

Accessibility & contrast

On white

3.92

#637EC9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.36

#637EC9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637EC9

5.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637EC9	#FFFFFF	#000000	##000000
##637EC9	1.00	3.92	5.36	5.36
#FFFFFF	3.92	1.00	21.00	21.00
#000000	5.36	21.00	1.00	1.00
##000000	5.36	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6185CC

Deuteranopia (green-blind)

#567CC7

Tritanopia (blue-blind)

#358E9A

Achromatopsia (no color)

#818181

Design tokens & code

CSS

--color: #637ec9;
/* rgb */ color: rgb(99, 126, 201);
/* oklch */ color: oklch(60.6% 0.119 267.8);

Tailwind

colors: {
  custom: {
    50: '#95a3da',
    500: '#637ec9',
    950: '#000000',
  },
}

SCSS

$custom: #637ec9;
$custom-light: #95a3da;
$custom-dark: #000000;

JSON

{
  "hex": "#637ec9",
  "rgb": {
    "r": 99,
    "g": 126,
    "b": 201
  },
  "hsl": {
    "h": 224.118,
    "s": 48.571,
    "l": 58.824
  },
  "oklch": {
    "l": 0.60569,
    "c": 0.11871,
    "h": 267.8
  },
  "luminance": 0.21791
}

Semantic roles & 50–950 ramp

primary

#637EC9

secondary

#D8CDB0

accent

#B450D8

background

#F9FAFD

surface

#F2F3FA

border

#CCCDD3

text

#0E0F15

muted

#7E7F83

Preview Lab

Preview with #637EC9

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

Preview Lab → · Contrast checker → · Palette generator →