Palettes / Colors / #644DFF

#644DFF — Vivid Blue

#644DFF is a blue color we call Vivid Blue, closest to the named color SlateBlue (#6A5ACD). It belongs to the blue family.

Color name

Closest CSS keyword: slateblue (#6A5ACD) — not an exact match. CSS slateblue gives you #6A5ACD, a different color; use #644DFF 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.

#644DFF is a cool blue color associated with trust, calm and professionalism. It is saturated enough to be the accent — buttons, highlights and calls to action — while neutrals do the quiet work around it.

Its strongest partner is its complement #E7FF4D; it also sits naturally between #4D8EFF and #BE4DFF. 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 30% · Blue 100%

Cyan 61% · Magenta 70% · Yellow 0% · Key 0%

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

Previews

CSS code for #644DFF

.text { color: #644DFF; }
.background { background-color: #644DFF; }
.border { border: 3px solid #644DFF; }
.text-rgb { color: rgb(100, 77, 255); }
.text-hsl { color: hsl(248, 100%, 65%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #644DFF; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(100, 77, 255, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #644DFF; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(100, 77, 255, 0.8); }

HTML: <p style="color:#644DFF">Text here</p> · <div style="background-color:#644DFF">Div content here</div>

Shades of #644DFF

Tints of #644DFF

Tones of #644DFF

Color harmonies

Complementary — #E7FF4D:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #644DFF: #FFFFFF.

Semi-transparent (opacity) text on #644DFF

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 #644DFF 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 #644DFF 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

← #644DFE  ·  #644E00 →

Frequently asked questions

What color is #644DFF?

#644DFF is Vivid Blue, a blue color (RGB 100, 77, 255). Its closest standard named color is SlateBlue.

What is the RGB and HSL of #644DFF?

#644DFF is RGB 100, 77, 255 — HSL 248°, 100%, 65% — CMYK 61%, 70%, 0%, 0%.

What colors go with #644DFF?

Its complement is #E7FF4D; analogous partners are #4D8EFF and #BE4DFF. It also appears in 6+ palettes in our collection.

Can I use #644DFF for text?

White text on #644DFF has a contrast ratio of 5.19:1 (passes WCAG AA); black text gives 4.05:1.