#645b9b

Color #645b9b

A muted medium blue.

Closest named color Dark Slate Blue #483d8b · ΔE 15.58 Nearest Tailwind class slate-600 #45556c · ΔE 11.5

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

Conversions

HEX

#645b9b

RGB

rgb(100, 91, 155)

HSL

hsl(248.4, 26%, 48.2%)

HSV / HSB

hsv(248.4, 41.3%, 60.8%)

CMYK

cmyk(35.5%, 41.3%, 0%, 39.2%)

LAB

lab(42.09, 19.28, -33.7)

LCH

lch(42.09, 38.83, 299.77)

OKLCH

oklch(50.8%, 0.0999, 288.8)

HWB

hwb(248.4, 35.7%, 39.2%)

Harmony colors

Complementary

#929b5b

Analogous

#5b729b

#645b9b

#845b9b

Triadic

#645b9b

#9b645b

#5b9b64

Split-complementary

#645b9b

#9b845b

#729b5b

Tetradic

#645b9b

#9b5b92

#929b5b

#5b9b64

Square

#645b9b

#9b5b72

#929b5b

#5b9b84

Shades

Color #645b9b mixed toward black.

#534c81

#433d67

#322d4d

#211e34

#110f1a

Tints

Color #645b9b mixed toward white.

#7c74ae

#9690be

#b1acce

#cbc8de

#e5e3ef

Tones

Color #645b9b mixed toward gray.

#686096

#6c6690

#6f6b8b

#737086

#777680

Accessibility

Aa White text on this color

5.98:1

Aa Black text on this color

3.51:1

White text reads better on this background (5.98:1). That passes WCAG AA (≥4.5:1) for normal-size text, but not AAA.

Under color vision deficiencies

Protanopia

#60608f · ΔE 4

Deuteranopia

#61618c · ΔE 4.9

Tritanopia

#648482 · ΔE 26.8

Achromatopsia

#636363 · ΔE 21.6

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

Code

CSS

background-color: #645b9b;

Tailwind (arbitrary value)

bg-[#645b9b]

Related colors

Dark Slate Blue #483d8b

Medium Slate Blue #7b68ee

Slate Blue #6a5acd

Navy #000080

Lavender #e6e6fa

Blue #0000ff

Frequently asked questions

#645b9b (#645b9b) is rgb(100, 91, 155) in RGB.

No, #645b9b 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 #645b9b, or check how it holds up for accessibility.

Generate a palette → Check contrast