#665bb0

Color #665bb0

A muted medium blue.

Closest named color Dark Slate Blue #483d8b · ΔE 12.74 Nearest Tailwind class slate-500 #62748e · ΔE 11

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Conversions

HEX

#665bb0

RGB

rgb(102, 91, 176)

HSL

hsl(247.8, 35%, 52.4%)

HSV / HSB

hsv(247.8, 48.3%, 69%)

CMYK

cmyk(42%, 48.3%, 0%, 31%)

LAB

lab(43.42, 25.89, -44.01)

LCH

lch(43.42, 51.06, 300.47)

OKLCH

oklch(52.3%, 0.1303, 286.91)

HWB

hwb(247.8, 35.7%, 31%)

Harmony colors

Complementary

#a5b05b

Analogous

#5b7bb0

#665bb0

#915bb0

Triadic

#665bb0

#b0665b

#5bb066

Split-complementary

#665bb0

#b0915b

#7bb05b

Tetradic

#665bb0

#b05ba5

#a5b05b

#5bb066

Square

#665bb0

#b05b7b

#a5b05b

#5bb091

Shades

Color #665bb0 mixed toward black.

#534896

#423a78

#322b5a

#211d3c

#110e1e

Tints

Color #665bb0 mixed toward white.

#8076bd

#9992ca

#b3add8

#ccc8e5

#e6e4f2

Tones

Color #665bb0 mixed toward gray.

#6b62a9

#7169a2

#76709b

#7b7794

#807f8d

Accessibility

Aa White text on this color

5.69:1

Aa Black text on this color

3.69:1

White text reads better on this background (5.69:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#6161a1 · ΔE 4

Deuteranopia

#62639d · ΔE 5.2

Tritanopia

#659390 · ΔE 30.9

Achromatopsia

#676767 · ΔE 24.2

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

Code

CSS

background-color: #665bb0;

Tailwind (arbitrary value)

bg-[#665bb0]

Related colors

Slate Blue #6a5acd

Dark Slate Blue #483d8b

Medium Slate Blue #7b68ee

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Frequently asked questions

#665bb0 (#665bb0) is rgb(102, 91, 176) in RGB.

No, #665bb0 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 #665bb0, or check how it holds up for accessibility.

Generate a palette → Check contrast