#637BC9#637BC9

#637BC9 is a mid, vivid blue. Relative luminance 0.210; OKLCH L 59.9% C 0.122 H 269.5°. Best body text is #000000 at 5.21:1 contrast (WCAG AA passes).

Color values

HEX	#637BC9
RGB	rgb(99, 123, 201)
HSL	hsl(226, 49%, 59%)
HSV	hsv(226, 51%, 79%)
CMYK	cmyk(50.7%, 38.8%, 0%, 21.2%)
CIE-LAB	lab(52.99, 13.17, -43.28)
CIE-LCH	lch(52.99, 45.24, 286.92°)
OKLab	oklab(59.94% -0.001 -0.1224)
OKLCH	oklch(59.94% 0.122 269.5)
XYZ	xyz(22.7677, 21.0341, 58.1073)
Luminance	0.2104 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BC9 #C9B163

analogous

#63AEC9 #637BC9 #7E63C9

triadic

#637BC9 #C9637B #7BC963

tetradic

#637BC9 #C963AE #C9B163 #63C97E

square

#637BC9 #C963AE #C9B163 #63C97E

split-complementary

#637BC9 #C97E63 #AEC963

monochromatic

#2E4284 #3D59B1 #637BC9 #90A1D9 #BEC8E8

Accessibility & contrast

On white

4.03

#637BC9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.21

#637BC9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BC9

5.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BC9	#FFFFFF	#000000	##000000
##637BC9	1.00	4.03	5.21	5.21
#FFFFFF	4.03	1.00	21.00	21.00
#000000	5.21	21.00	1.00	1.00
##000000	5.21	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C83CC

Deuteranopia (green-blind)

#517AC7

Tritanopia (blue-blind)

#368C98

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #637bc9;
/* rgb */ color: rgb(99, 123, 201);
/* oklch */ color: oklch(59.9% 0.122 269.5);

Tailwind

colors: {
  custom: {
    50: '#95a0da',
    500: '#637bc9',
    950: '#000000',
  },
}

SCSS

$custom: #637bc9;
$custom-light: #95a0da;
$custom-dark: #000000;

JSON

{
  "hex": "#637bc9",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 201
  },
  "hsl": {
    "h": 225.882,
    "s": 48.571,
    "l": 58.824
  },
  "oklch": {
    "l": 0.59939,
    "c": 0.12241,
    "h": 269.5
  },
  "luminance": 0.21036
}

Semantic roles & 50–950 ramp

primary

#637BC9

secondary

#D8CFB0

accent

#B850D8

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0E15

muted

#7E7E83

Preview Lab

Preview with #637BC9

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

Preview Lab → · Contrast checker → · Palette generator →