Palettes / Colors / #645CBB

#645CBB — Muted Blue

#645CBB is a blue color we call Muted Blue, closest to the named color SlateBlue (#6A5ACD). It belongs to the blue family.

#645CBB is a cool blue color associated with trust, calm and professionalism. It sits comfortably in the middle: usable for large areas in soft schemes, or as a supporting color beside something stronger.

Its strongest partner is its complement #B3BB5D; it also sits naturally between #5D84BB and #945DBB. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 39% · Green 36% · Blue 73%

Cyan 47% · Magenta 51% · Yellow 0% · Key 27%

Previews

CSS code for #645CBB

.text { color: #645CBB; }
.background { background-color: #645CBB; }
.border { border: 3px solid #645CBB; }
.text-rgb { color: rgb(100, 92, 187); }
.text-hsl { color: hsl(245, 41%, 55%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #645CBB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(100, 92, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #645CBB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(100, 92, 187, 0.8); }

HTML: <p style="color:#645CBB">Text here</p> · <div style="background-color:#645CBB">Div content here</div>

Shades of #645CBB

Tints of #645CBB

Tones of #645CBB

Color harmonies

Complementary — #B3BB5D:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #645CBB: #FFFFFF.

How #645CBB looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with #645CBB

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #645CBA  ·  #645CBC →

Frequently asked questions

What color is #645CBB?

#645CBB is Muted Blue, a blue color (RGB 100, 92, 187). Its closest standard named color is SlateBlue.

What is the RGB and HSL of #645CBB?

#645CBB is RGB 100, 92, 187 — HSL 245°, 41%, 55% — CMYK 47%, 51%, 0%, 27%.

What colors go with #645CBB?

Its complement is #B3BB5D; analogous partners are #5D84BB and #945DBB. It also appears in 6+ palettes in our collection.

Can I use #645CBB for text?

White text on #645CBB has a contrast ratio of 5.54:1 (passes WCAG AA); black text gives 3.79:1.