Palettes / Colors / #646AAA

#646AAA — Dusty Blue

#646AAA is a blue color we call Dusty Blue, closest to the named color SlateGray (#708090). It belongs to the blue family.

Color name

Closest CSS keyword: slategray (#708090) — not an exact match. CSS slategray gives you #708090, a different color; use #646AAA when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#646AAA 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 #AAA464; it also sits naturally between #648DAA and #8164AA. 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 67%

Cyan 41% · Magenta 38% · Yellow 0% · Key 33%

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

Previews

CSS code for #646AAA

.text { color: #646AAA; }
.background { background-color: #646AAA; }
.border { border: 3px solid #646AAA; }
.text-rgb { color: rgb(100, 106, 170); }
.text-hsl { color: hsl(235, 29%, 53%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #646AAA; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(100, 106, 170, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #646AAA; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(100, 106, 170, 0.8); }

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

Shades of #646AAA

Tints of #646AAA

Tones of #646AAA

Color harmonies

Complementary — #AAA464:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #646AAA: #FFFFFF.

Semi-transparent (opacity) text on #646AAA

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #646AAA 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 #646AAA 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

← #646AA9  ·  #646AAB →

Frequently asked questions

What color is #646AAA?

#646AAA is Dusty Blue, a blue color (RGB 100, 106, 170). Its closest standard named color is SlateGray.

What is the RGB and HSL of #646AAA?

#646AAA is RGB 100, 106, 170 — HSL 235°, 29%, 53% — CMYK 41%, 38%, 0%, 33%.

What colors go with #646AAA?

Its complement is #AAA464; analogous partners are #648DAA and #8164AA. It also appears in 6+ palettes in our collection.

Can I use #646AAA for text?

White text on #646AAA has a contrast ratio of 5.02:1 (passes WCAG AA); black text gives 4.18:1.