#637BE7#637BE7

#637BE7 is a mid, vivid blue. Relative luminance 0.226; OKLCH L 61.7% C 0.164 H 271.4°. Best body text is #000000 at 5.52:1 contrast (WCAG AA passes).

Color values

HEX	#637BE7
RGB	rgb(99, 123, 231)
HSL	hsl(229, 73%, 65%)
HSV	hsv(229, 57%, 91%)
CMYK	cmyk(57.1%, 46.8%, 0%, 9.4%)
CIE-LAB	lab(54.64, 22.75, -57.57)
CIE-LCH	lch(54.64, 61.90, 291.56°)
OKLab	oklab(61.74% 0.0041 -0.1643)
OKLCH	oklch(61.74% 0.164 271.4)
XYZ	xyz(26.6476, 22.5861, 78.5411)
Luminance	0.2259 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BE7 #E7CF63

analogous

#63BDE7 #637BE7 #8D63E7

triadic

#637BE7 #E7637B #7BE763

tetradic

#637BE7 #E763BD #E7CF63 #63E78D

square

#637BE7 #E763BD #E7CF63 #63E78D

split-complementary

#637BE7 #E78D63 #BDE763

monochromatic

#1C37B4 #2E4EDF #637BE7 #98A8EF #CDD5F7

Accessibility & contrast

On white

3.81

#637BE7 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.52

#637BE7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BE7

5.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BE7	#FFFFFF	#000000	##000000
##637BE7	1.00	3.81	5.52	5.52
#FFFFFF	3.81	1.00	21.00	21.00
#000000	5.52	21.00	1.00	1.00
##000000	5.52	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4789EB

Deuteranopia (green-blind)

#347DE5

Tritanopia (blue-blind)

#0093A6

Achromatopsia (no color)

#838383

Design tokens & code

CSS

--color: #637be7;
/* rgb */ color: rgb(99, 123, 231);
/* oklch */ color: oklch(61.7% 0.164 271.4);

Tailwind

colors: {
  custom: {
    50: '#99a0ef',
    500: '#637be7',
    950: '#000000',
  },
}

SCSS

$custom: #637be7;
$custom-light: #99a0ef;
$custom-dark: #000000;

JSON

{
  "hex": "#637be7",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 231
  },
  "hsl": {
    "h": 229.091,
    "s": 73.333,
    "l": 64.706
  },
  "oklch": {
    "l": 0.61744,
    "c": 0.16433,
    "h": 271.4
  },
  "luminance": 0.22588
}

Semantic roles & 50–950 ramp

primary

#637BE7

secondary

#EAE1BC

accent

#B210D5

background

#FAF9FE

surface

#F3F2FD

border

#CDCCD5

text

#0F0E16

muted

#7F7E84

Preview Lab

Preview with #637BE7

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

Preview Lab → · Contrast checker → · Palette generator →