Palettes / Colors / #646BBD

#646BBD — Muted Blue

#646BBD is a blue color we call Muted Blue, closest to the named color SlateBlue (#6A5ACD). It belongs to the blue family.

#646BBD 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 #BDB665; it also sits naturally between #6599BD and #8A65BD. 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 42% · Blue 74%

Cyan 47% · Magenta 43% · Yellow 0% · Key 26%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #646BBD

.text { color: #646BBD; }
.background { background-color: #646BBD; }
.border { border: 3px solid #646BBD; }
.text-rgb { color: rgb(100, 107, 189); }
.text-hsl { color: hsl(235, 40%, 57%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #646BBD; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(100, 107, 189, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #646BBD; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(100, 107, 189, 0.8); }

HTML: <p style="color:#646BBD">Text here</p> · <div style="background-color:#646BBD">Div content here</div>

Shades of #646BBD

Tints of #646BBD

Tones of #646BBD

Color harmonies

Complementary — #BDB665:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #646BBD: #FFFFFF.

How #646BBD 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 a similar color

These palettes use a close neighbour of #646BBD rather than the exact color:

Similar colors

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

Browse neighbouring colors

← #646BBC  ·  #646BBE →

Frequently asked questions

What color is #646BBD?

#646BBD is Muted Blue, a blue color (RGB 100, 107, 189). Its closest standard named color is SlateBlue.

What is the RGB and HSL of #646BBD?

#646BBD is RGB 100, 107, 189 — HSL 235°, 40%, 57% — CMYK 47%, 43%, 0%, 26%.

What colors go with #646BBD?

Its complement is #BDB665; analogous partners are #6599BD and #8A65BD. It also appears in 6+ palettes in our collection.

Can I use #646BBD for text?

White text on #646BBD has a contrast ratio of 4.79:1 (passes WCAG AA); black text gives 4.38:1.