#666CFB#666CFB
#666CFB is a mid, highly saturated blue. Relative luminance 0.205; OKLCH L 60.5% C 0.209 H 276.4°. Best body text is #000000 at 5.10:1 contrast (WCAG AA passes).
Color values
| HEX | #666CFB |
|---|---|
| RGB | rgb(102, 108, 251) |
| HSL | hsl(238, 95%, 69%) |
| HSV | hsv(238, 59%, 98%) |
| CMYK | cmyk(59.4%, 57%, 0%, 1.6%) |
| CIE-LAB | lab(52.41, 38.80, -72.30) |
| CIE-LCH | lch(52.41, 82.05, 298.22°) |
| OKLab | oklab(60.53% 0.0232 -0.2077) |
| OKLCH | oklch(60.53% 0.209 276.4) |
| XYZ | xyz(28.2490, 20.5128, 93.7188) |
| Luminance | 0.2051 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Mediumslateblue
#7B68EE
ΔE00 4.03
Cornflower
#6A79F7
ΔE00 4.03
Cornflower Blue
#5170D7
ΔE00 6.52
Royal Blue
#4169E1
ΔE00 6.75
Dark Periwinkle
#665FD1
ΔE00 7.27
Lightish Blue
#3D7AFD
ΔE00 7.61
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#666CFB #FBF566
analogous
#66B7FB #666CFB #AB66FB
triadic
#666CFB #FB666C #6CFB66
tetradic
#666CFB #FB66B7 #FBF566 #66FBAB
square
#666CFB #FB66B7 #FBF566 #66FBAB
split-complementary
#666CFB #FBAB66 #B7FB66
monochromatic
#060FE1 #2A33F9 #666CFB #A2A5FD #DDDFFE
Accessibility & contrast
On white
4.12
#666CFB on #FFFFFF
AA ✗AA large ✓AAA ✗
On black
5.10
#666CFB on #000000
AA ✓AA large ✓AAA ✗
Best text color
#000000 on #666CFB
5.10:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##666CFB | #FFFFFF | #000000 | ##000000 |
|---|---|---|---|---|
| ##666CFB | 1.00 | 4.12 | 5.10 | 5.10 |
| #FFFFFF | 4.12 | 1.00 | 21.00 | 21.00 |
| #000000 | 5.10 | 21.00 | 1.00 | 1.00 |
| ##000000 | 5.10 | 21.00 | 1.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0083FF
Deuteranopia (green-blind)
#0077F8
Tritanopia (blue-blind)
#008EA9
Achromatopsia (no color)
#7D7D7D
Design tokens & code
CSS
--color: #666cfb; /* rgb */ color: rgb(102, 108, 251); /* oklch */ color: oklch(60.5% 0.209 276.4);
Tailwind
colors: {
custom: {
50: '#9f96fe',
500: '#666cfb',
950: '#000000',
},
}SCSS
$custom: #666cfb; $custom-light: #9f96fe; $custom-dark: #000000;
JSON
{
"hex": "#666cfb",
"rgb": {
"r": 102,
"g": 108,
"b": 251
},
"hsl": {
"h": 237.584,
"s": 94.904,
"l": 69.216
},
"oklch": {
"l": 0.60526,
"c": 0.20897,
"h": 276.4
},
"luminance": 0.20515
}Semantic roles & 50–950 ramp
primary
#666CFB
secondary
#F4F2C9
accent
#DC00E6
background
#FAF9FF
surface
#F4F2FF
border
#CECCD7
text
#100D18
muted
#7F7E86