#666cfd

Color #666cfd

A vivid, highly saturated light blue.

Closest named color Medium Slate Blue #7b68ee · ΔE 7.96 Nearest Tailwind class indigo-500 #615fff · ΔE 3.8

Open in Palette generator Color wheel Color mixer Contrast checker Blindness simulator Gradient

Conversions

HEX

#666cfd

RGB

rgb(102, 108, 253)

HSL

hsl(237.6, 97.4%, 69.6%)

HSV / HSB

hsv(237.6, 59.7%, 99.2%)

CMYK

cmyk(59.7%, 57.3%, 0%, 0.8%)

LAB

lab(52.55, 39.43, -73.18)

LCH

lch(52.55, 83.13, 298.32)

OKLCH

oklch(60.7%, 0.2116, 276.3)

HWB

hwb(237.6, 40%, 0.8%)

Harmony colors

Complementary

#fdf766

Analogous

#66b8fd

#666cfd

#ab66fd

Triadic

#666cfd

#fd666c

#6cfd66

Split-complementary

#666cfd

#fdab66

#b8fd66

Tetradic

#666cfd

#f766fd

#fdf766

#6cfd66

Square

#666cfd

#fd66b8

#fdf766

#66fdab

Shades

Color #666cfd mixed toward black.

#2c34fc

#030cea

#0209af

#020675

#01033a

Tints

Color #666cfd mixed toward white.

#7f85fd

#999dfe

#b2b6fe

#cccefe

#e5e7ff

Tones

Color #666cfd mixed toward gray.

#7378f0

#7f83e4

#8c8fd7

#989acb

#a5a6be

Accessibility

Aa White text on this color

4.09:1

Aa Black text on this color

5.13:1

Black text reads better on this background (5.13:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#6969e5 · ΔE 3.3

Deuteranopia

#6868de · ΔE 4.3

Tritanopia

#66cfc9 · ΔE 41.2

Achromatopsia

#7d7d7d · ΔE 29

Left half is the original, right half is the simulated appearance. See all 8 vision types →

Code

CSS

background-color: #666cfd;

Tailwind (arbitrary value)

bg-[#666cfd]

Related colors

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Dark Blue #00008b

Ghost White #f8f8ff

Medium Blue #0000cd

Frequently asked questions

#666cfd (#666cfd) is rgb(102, 108, 253) in RGB.

No, #666cfd is not one of the 216 web-safe colors — for that, every RGB channel would have to be a multiple of 51.

Related tools

Colors

HEX to RGB Converter

Convert any HEX color code to its RGB and HSL equivalents, live, with copy-to-clipboard values.

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Contrast Checker

Check the WCAG contrast ratio between any two colors, live, with AA/AAA pass-fail results.

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Palette Generator

Generate complementary, analogous, triadic, split-complementary, tetradic, square, and monochromatic palettes from any base color.

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Build something with this color

Generate a full palette from #666cfd, or check how it holds up for accessibility.

Generate a palette → Check contrast