#666BCB#666BCB

#666BCB is a mid, vivid blue. Relative luminance 0.177; OKLCH L 57.0% C 0.146 H 278.5°. Best body text is #FFFFFF at 4.64:1 contrast (WCAG AA passes).

Color values

HEX	#666BCB
RGB	rgb(102, 107, 203)
HSL	hsl(237, 49%, 60%)
HSV	hsv(237, 50%, 80%)
CMYK	cmyk(49.8%, 47.3%, 0%, 20.4%)
CIE-LAB	lab(49.07, 24.24, -50.64)
CIE-LCH	lch(49.07, 56.15, 295.58°)
OKLab	oklab(57.03% 0.0214 -0.144)
OKLCH	oklch(57.03% 0.146 278.5)
XYZ	xyz(21.5133, 17.6507, 58.7617)
Luminance	0.1765 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BCB #CBC666

analogous

#669DCB #666BCB #9466CB

triadic

#666BCB #CB666B #6BCB66

tetradic

#666BCB #CB669D #CBC666 #66CB94

square

#666BCB #CB669D #CBC666 #66CB94

split-complementary

#666BCB #CB9466 #9DCB66

monochromatic

#2E3388 #3E44B6 #666BCB #9497DB #C1C3EA

Accessibility & contrast

On white

4.64

#666BCB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.53

#666BCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666BCB

4.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BCB	#FFFFFF	#000000	##FFFFFF
##666BCB	1.00	4.64	4.53	4.64
#FFFFFF	4.64	1.00	21.00	1.00
#000000	4.53	21.00	1.00	21.00
##FFFFFF	4.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4179CF

Deuteranopia (green-blind)

#3871C9

Tritanopia (blue-blind)

#3E8091

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666bcb;
/* rgb */ color: rgb(102, 107, 203);
/* oklch */ color: oklch(57.0% 0.146 278.5);

Tailwind

colors: {
  custom: {
    50: '#9895db',
    500: '#666bcb',
    950: '#000000',
  },
}

SCSS

$custom: #666bcb;
$custom-light: #9895db;
$custom-dark: #000000;

JSON

{
  "hex": "#666bcb",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 203
  },
  "hsl": {
    "h": 237.03,
    "s": 49.268,
    "l": 59.804
  },
  "oklch": {
    "l": 0.57034,
    "c": 0.14561,
    "h": 278.5
  },
  "luminance": 0.17652
}

Semantic roles & 50–950 ramp

primary

#666BCB

secondary

#DAD8B3

accent

#D24FD9

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666BCB

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

Preview Lab → · Contrast checker → · Palette generator →