#666BF0#666BF0

#666BF0 is a mid, vivid blue. Relative luminance 0.196; OKLCH L 59.5% C 0.196 H 277.0°. Best body text is #000000 at 4.93:1 contrast (WCAG AA passes).

Color values

HEX	#666BF0
RGB	rgb(102, 107, 240)
HSL	hsl(238, 82%, 67%)
HSV	hsv(238, 58%, 94%)
CMYK	cmyk(57.5%, 55.4%, 0%, 5.9%)
CIE-LAB	lab(51.42, 35.89, -67.79)
CIE-LCH	lch(51.42, 76.70, 297.90°)
OKLab	oklab(59.55% 0.024 -0.1944)
OKLCH	oklch(59.55% 0.196 277)
XYZ	xyz(26.4603, 19.6295, 84.8157)
Luminance	0.1963 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BF0 #F0EB66

analogous

#66B0F0 #666BF0 #A666F0

triadic

#666BF0 #F0666B #6BF066

tetradic

#666BF0 #F066B0 #F0EB66 #66F0A6

square

#666BF0 #F066B0 #F0EB66 #66F0A6

split-complementary

#666BF0 #F0A666 #B0F066

monochromatic

#141AC8 #2E35EB #666BF0 #9EA1F5 #D5D7FB

Accessibility & contrast

On white

4.26

#666BF0 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.93

#666BF0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666BF0

4.93:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BF0	#FFFFFF	#000000	##000000
##666BF0	1.00	4.26	4.93	4.93
#FFFFFF	4.26	1.00	21.00	21.00
#000000	4.93	21.00	1.00	1.00
##000000	4.93	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0080F5

Deuteranopia (green-blind)

#0075ED

Tritanopia (blue-blind)

#008AA3

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #666bf0;
/* rgb */ color: rgb(102, 107, 240);
/* oklch */ color: oklch(59.5% 0.196 277.0);

Tailwind

colors: {
  custom: {
    50: '#9d95f6',
    500: '#666bf0',
    950: '#000000',
  },
}

SCSS

$custom: #666bf0;
$custom-light: #9d95f6;
$custom-dark: #000000;

JSON

{
  "hex": "#666bf0",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 240
  },
  "hsl": {
    "h": 237.826,
    "s": 82.143,
    "l": 67.059
  },
  "oklch": {
    "l": 0.59546,
    "c": 0.1959,
    "h": 277
  },
  "luminance": 0.19631
}

Semantic roles & 50–950 ramp

primary

#666BF0

secondary

#EFEDC3

accent

#D707DF

background

#FAF9FF

surface

#F4F1FF

border

#CECBD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666BF0

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

Preview Lab → · Contrast checker → · Palette generator →