#666c91

Color #666c91

A muted medium blue.

Closest named color Slate Gray #708090 · ΔE 15.05 Nearest Tailwind class slate-500 #62748e · ΔE 6.9

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Conversions

HEX

#666c91

RGB

rgb(102, 108, 145)

HSL

hsl(231.6, 17.4%, 48.4%)

HSV / HSB

hsv(231.6, 29.7%, 56.9%)

CMYK

cmyk(29.7%, 25.5%, 0%, 43.1%)

LAB

lab(46.44, 6.67, -20.96)

LCH

lch(46.44, 22, 287.65)

OKLCH

oklch(54.1%, 0.0583, 277.09)

HWB

hwb(231.6, 40%, 43.1%)

Harmony colors

Complementary

#918b66

Analogous

#668191

#666c91

#756691

Triadic

#666c91

#91666c

#6c9166

Split-complementary

#666c91

#917566

#819166

Tetradic

#666c91

#8b6691

#918b66

#6c9166

Square

#666c91

#916681

#918b66

#669175

Shades

Color #666c91 mixed toward black.

#555a79

#444861

#333648

#222430

#111218

Tints

Color #666c91 mixed toward white.

#7e84a4

#989cb7

#b2b5c9

#cccedb

#e5e6ed

Tones

Color #666c91 mixed toward gray.

#6a6f8d

#6d718a

#717486

#747683

#78797f

Accessibility

Aa White text on this color

5.1:1

Aa Black text on this color

4.12:1

White text reads better on this background (5.1:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#696989 · ΔE 2.8

Deuteranopia

#686887 · ΔE 3.2

Tritanopia

#668381 · ΔE 21.6

Achromatopsia

#6e6e6e · ΔE 15.2

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

Code

CSS

background-color: #666c91;

Tailwind (arbitrary value)

bg-[#666c91]

Related colors

Royal Blue #4169e1

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Dark Blue #00008b

Ghost White #f8f8ff

Frequently asked questions

#666c91 (#666c91) is rgb(102, 108, 145) in RGB.

No, #666c91 is not web-safe. The nearest web-safe colors are among its tones and shades below.

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 #666c91, or check how it holds up for accessibility.

Generate a palette → Check contrast