#666FDB#666FDB

#666FDB is a mid, vivid blue. Relative luminance 0.193; OKLCH L 58.8% C 0.163 H 276.6°. Best body text is #000000 at 4.86:1 contrast (WCAG AA passes).

Color values

HEX	#666FDB
RGB	rgb(102, 111, 219)
HSL	hsl(235, 62%, 63%)
HSV	hsv(235, 53%, 86%)
CMYK	cmyk(53.4%, 49.3%, 0%, 14.1%)
CIE-LAB	lab(51.04, 26.81, -56.58)
CIE-LCH	lch(51.04, 62.61, 295.35°)
OKLab	oklab(58.84% 0.0187 -0.1614)
OKLCH	oklch(58.84% 0.163 276.6)
XYZ	xyz(23.9461, 19.3066, 69.4688)
Luminance	0.1931 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FDB #DBD266

analogous

#66A9DB #666FDB #9866DB

triadic

#666FDB #DB666F #6FDB66

tetradic

#666FDB #DB66A9 #DBD266 #66DB98

square

#666FDB #DB66A9 #DBD266 #66DB98

split-complementary

#666FDB #DB9866 #A9DB66

monochromatic

#262FA1 #3440CF #666FDB #989EE7 #C9CCF2

Accessibility & contrast

On white

4.32

#666FDB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.86

#666FDB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FDB

4.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FDB	#FFFFFF	#000000	##000000
##666FDB	1.00	4.32	4.86	4.86
#FFFFFF	4.32	1.00	21.00	21.00
#000000	4.86	21.00	1.00	1.00
##000000	4.86	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3A7FDF

Deuteranopia (green-blind)

#2B75D9

Tritanopia (blue-blind)

#2F879B

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #666fdb;
/* rgb */ color: rgb(102, 111, 219);
/* oklch */ color: oklch(58.8% 0.163 276.6);

Tailwind

colors: {
  custom: {
    50: '#9a98e7',
    500: '#666fdb',
    950: '#000000',
  },
}

SCSS

$custom: #666fdb;
$custom-light: #9a98e7;
$custom-dark: #000000;

JSON

{
  "hex": "#666fdb",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 219
  },
  "hsl": {
    "h": 235.385,
    "s": 61.905,
    "l": 62.941
  },
  "oklch": {
    "l": 0.58835,
    "c": 0.16252,
    "h": 276.6
  },
  "luminance": 0.19308
}

Semantic roles & 50–950 ramp

primary

#666FDB

secondary

#E3E0B9

accent

#BC1CCA

background

#F9F9FE

surface

#F2F2FC

border

#CCCCD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666FDB

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

Preview Lab → · Contrast checker → · Palette generator →