#665cb5

Color #665cb5

A muted medium blue.

Closest named color Dark Slate Blue #483d8b · ΔE 13.75 Nearest Tailwind class indigo-500 #615fff · ΔE 10.4

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

Conversions

HEX

#665cb5

RGB

rgb(102, 92, 181)

HSL

hsl(246.7, 37.6%, 53.5%)

HSV / HSB

hsv(246.7, 49.2%, 71%)

CMYK

cmyk(43.6%, 49.2%, 0%, 29%)

LAB

lab(43.97, 26.76, -46.07)

LCH

lch(43.97, 53.28, 300.15)

OKLCH

oklch(52.8%, 0.1359, 285.89)

HWB

hwb(246.7, 36.1%, 29%)

Harmony colors

Complementary

#abb55c

Analogous

#5c7eb5

#665cb5

#925cb5

Triadic

#665cb5

#b5665c

#5cb566

Split-complementary

#665cb5

#b5925c

#7eb55c

Tetradic

#665cb5

#b55cab

#abb55c

#5cb566

Square

#665cb5

#b55c7e

#abb55c

#5cb592

Shades

Color #665cb5 mixed toward black.

#50479c

#40397d

#302b5e

#201c3f

#100e1f

Tints

Color #665cb5 mixed toward white.

#7f77c1

#9992ce

#b2adda

#ccc9e6

#e5e4f3

Tones

Color #665cb5 mixed toward gray.

#6c63ae

#716ba6

#77729f

#7d7a97

#838190

Accessibility

Aa White text on this color

5.58:1

Aa Black text on this color

3.76:1

White text reads better on this background (5.58:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#6262a5 · ΔE 4

Deuteranopia

#6263a1 · ΔE 4.9

Tritanopia

#669793 · ΔE 32.1

Achromatopsia

#686868 · ΔE 24.5

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

Code

CSS

background-color: #665cb5;

Tailwind (arbitrary value)

bg-[#665cb5]

Related colors

Slate Blue #6a5acd

Dark Slate Blue #483d8b

Medium Slate Blue #7b68ee

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Frequently asked questions

#665cb5 (#665cb5) is rgb(102, 92, 181) in RGB.

No, #665cb5 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 #665cb5, or check how it holds up for accessibility.

Generate a palette → Check contrast