#666EF3#666EF3

#666EF3 is a mid, vivid blue. Relative luminance 0.204; OKLCH L 60.3% C 0.196 H 276.2°. Best body text is #000000 at 5.09:1 contrast (WCAG AA passes).

Color values

HEX	#666EF3
RGB	rgb(102, 110, 243)
HSL	hsl(237, 85%, 68%)
HSV	hsv(237, 58%, 95%)
CMYK	cmyk(58%, 54.7%, 0%, 4.7%)
CIE-LAB	lab(52.34, 35.05, -67.97)
CIE-LCH	lch(52.34, 76.47, 297.28°)
OKLab	oklab(60.3% 0.0212 -0.1949)
OKLCH	oklch(60.3% 0.196 276.2)
XYZ	xyz(27.2279, 20.4457, 87.2882)
Luminance	0.2045 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EF3 #F3EB66

analogous

#66B4F3 #666EF3 #A566F3

triadic

#666EF3 #F3666E #6EF366

tetradic

#666EF3 #F366B4 #F3EB66 #66F3A5

square

#666EF3 #F366B4 #F3EB66 #66F3A5

split-complementary

#666EF3 #F3A566 #B4F366

monochromatic

#101BCE #2D38EF #666EF3 #9FA4F7 #D7DAFC

Accessibility & contrast

On white

4.13

#666EF3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.09

#666EF3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666EF3

5.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EF3	#FFFFFF	#000000	##000000
##666EF3	1.00	4.13	5.09	5.09
#FFFFFF	4.13	1.00	21.00	21.00
#000000	5.09	21.00	1.00	1.00
##000000	5.09	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#0283F8

Deuteranopia (green-blind)

#0077F0

Tritanopia (blue-blind)

#008DA6

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #666ef3;
/* rgb */ color: rgb(102, 110, 243);
/* oklch */ color: oklch(60.3% 0.196 276.2);

Tailwind

colors: {
  custom: {
    50: '#9d97f8',
    500: '#666ef3',
    950: '#000000',
  },
}

SCSS

$custom: #666ef3;
$custom-light: #9d97f8;
$custom-dark: #000000;

JSON

{
  "hex": "#666ef3",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 243
  },
  "hsl": {
    "h": 236.596,
    "s": 85.455,
    "l": 67.647
  },
  "oklch": {
    "l": 0.60297,
    "c": 0.19609,
    "h": 276.2
  },
  "luminance": 0.20448
}

Semantic roles & 50–950 ramp

primary

#666EF3

secondary

#F0EEC5

accent

#D504E2

background

#FAF9FF

surface

#F4F2FF

border

#CECCD7

text

#0F0D17

muted

#7F7E85

Preview Lab

Preview with #666EF3

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

Preview Lab → · Contrast checker → · Palette generator →