Palettes / Colors / #643FDD

#643FDD — Blue

#643FDD is a blue color we call 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 #643FDD 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.

#643FDD 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 #B9DD40; it also sits naturally between #406ADD and #B340DD. 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 25% · Blue 87%

Cyan 55% · Magenta 71% · Yellow 0% · Key 13%

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

Previews

CSS code for #643FDD

.text { color: #643FDD; }
.background { background-color: #643FDD; }
.border { border: 3px solid #643FDD; }
.text-rgb { color: rgb(100, 63, 221); }
.text-hsl { color: hsl(254, 70%, 56%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #643FDD; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(100, 63, 221, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #643FDD; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(100, 63, 221, 0.8); }

HTML: <p style="color:#643FDD">Text here</p> · <div style="background-color:#643FDD">Div content here</div>

Shades of #643FDD

Tints of #643FDD

Tones of #643FDD

Color harmonies

Complementary — #B9DD40:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #643FDD: #FFFFFF.

Semi-transparent (opacity) text on #643FDD

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 #643FDD 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 #643FDD 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

← #643FDC  ·  #643FDE →

Frequently asked questions

What color is #643FDD?

#643FDD is Blue, a blue color (RGB 100, 63, 221). Its closest standard named color is SlateBlue.

What is the RGB and HSL of #643FDD?

#643FDD is RGB 100, 63, 221 — HSL 254°, 70%, 56% — CMYK 55%, 71%, 0%, 13%.

What colors go with #643FDD?

Its complement is #B9DD40; analogous partners are #406ADD and #B340DD. It also appears in 6+ palettes in our collection.

Can I use #643FDD for text?

White text on #643FDD has a contrast ratio of 6.37:1 (passes WCAG AA); black text gives 3.30:1.