#666491

Color #666491

A muted medium blue.

Closest named color Steel Blue #4682b4 · ΔE 19.33 Nearest Tailwind class slate-500 #62748e · ΔE 10.1

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Conversions

HEX

#666491

RGB

rgb(102, 100, 145)

HSL

hsl(242.7, 18.4%, 48%)

HSV / HSB

hsv(242.7, 31%, 56.9%)

CMYK

cmyk(29.7%, 31%, 0%, 43.1%)

LAB

lab(44.21, 11.56, -24.4)

LCH

lch(44.21, 27, 295.35)

OKLCH

oklch(52.3%, 0.0703, 285.76)

HWB

hwb(242.7, 39.2%, 43.1%)

Harmony colors

Complementary

#8f9164

Analogous

#647891

#666491

#7c6491

Triadic

#666491

#916664

#649166

Split-complementary

#666491

#917c64

#789164

Tetradic

#666491

#91648f

#8f9164

#649166

Square

#666491

#916478

#8f9164

#64917c

Shades

Color #666491 mixed toward black.

#555379

#444361

#333248

#222130

#111118

Tints

Color #666491 mixed toward white.

#7e7ca5

#9896b7

#b2b1c9

#cbcbdb

#e5e5ed

Tones

Color #666491 mixed toward gray.

#69688d

#6d6b89

#706f86

#747382

#77777e

Accessibility

Aa White text on this color

5.53:1

Aa Black text on this color

3.8:1

White text reads better on this background (5.53:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#656588 · ΔE 2.9

Deuteranopia

#656585 · ΔE 3.8

Tritanopia

#66807e · ΔE 23.9

Achromatopsia

#686868 · ΔE 17.8

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

Code

CSS

background-color: #666491;

Tailwind (arbitrary value)

bg-[#666491]

Related colors

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Dark Blue #00008b

Ghost White #f8f8ff

Medium Blue #0000cd

Frequently asked questions

#666491 (#666491) is rgb(102, 100, 145) in RGB.

No, #666491 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.

Try it → Accessibility

Contrast Checker

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

Try it → Generators

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 #666491, or check how it holds up for accessibility.

Generate a palette → Check contrast