#666DF1#666DF1

#666DF1 is a mid, vivid blue. Relative luminance 0.201; OKLCH L 60.0% C 0.195 H 276.5°. Best body text is #000000 at 5.02:1 contrast (WCAG AA passes).

Color values

HEX#666DF1
RGBrgb(102, 109, 241)
HSLhsl(237, 83%, 67%)
HSVhsv(237, 58%, 95%)
CMYKcmyk(57.7%, 54.8%, 0%, 5.5%)
CIE-LABlab(51.96, 35.01, -67.46)
CIE-LCHlch(51.96, 76.00, 297.43°)
OKLaboklab(59.98% 0.0221 -0.1934)
OKLCHoklch(59.98% 0.195 276.5)
XYZxyz(26.8202, 20.1110, 85.6705)
Luminance0.2011 (WCAG relative)
Temperaturecool
Familyblue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#666DF1 #F1EA66
analogous
#66B3F1 #666DF1 #A466F1
triadic
#666DF1 #F1666D #6DF166
tetradic
#666DF1 #F166B3 #F1EA66 #66F1A4
square
#666DF1 #F166B3 #F1EA66 #66F1A4
split-complementary
#666DF1 #F1A466 #B3F166
monochromatic
#121CCA #2E37EC #666DF1 #9EA3F6 #D6D8FB

Accessibility & contrast

On white

4.18
#666DF1 on #FFFFFF
AA ✗AA large ✓AAA ✗

On black

5.02
#666DF1 on #000000
AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DF1
5.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##666DF1#FFFFFF#000000##000000
##666DF11.004.185.025.02
#FFFFFF4.181.0021.0021.00
#0000005.0221.001.001.00
##0000005.0221.001.001.00

Color blindness preview

Protanopia (red-blind)
#0382F6
Deuteranopia (green-blind)
#0076EE
Tritanopia (blue-blind)
#008CA4
Achromatopsia (no color)
#7C7C7C

Design tokens & code

CSS
--color: #666df1;
/* rgb */ color: rgb(102, 109, 241);
/* oklch */ color: oklch(60.0% 0.195 276.5);
Tailwind
colors: {
  custom: {
    50: '#9d96f6',
    500: '#666df1',
    950: '#000000',
  },
}
SCSS
$custom: #666df1;
$custom-light: #9d96f6;
$custom-dark: #000000;
JSON
{
  "hex": "#666df1",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 241
  },
  "hsl": {
    "h": 236.978,
    "s": 83.234,
    "l": 67.255
  },
  "oklch": {
    "l": 0.59975,
    "c": 0.19471,
    "h": 276.5
  },
  "luminance": 0.20113
}

Semantic roles & 50–950 ramp

primary
#666DF1
secondary
#EFEDC3
accent
#D506E0
background
#FAF9FF
surface
#F4F2FF
border
#CECCD7
text
#0F0D17
muted
#7F7E85

Preview Lab

Preview with #666DF1

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

Preview Lab → · Contrast checker → · Palette generator →

#666DF1 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva