Palettes / Colors / #643FC9

#643FC9 — Purple

#643FC9 is a purple color we call Purple, closest to the named color SlateBlue (#6A5ACD). It belongs to the purple family.

Color name

Closest CSS keyword: slateblue (#6A5ACD) — not an exact match. CSS slateblue gives you #6A5ACD, a different color; use #643FC9 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.

#643FC9 is a cool purple color associated with luxury, creativity and mystery. 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 #A5C940; it also sits naturally between #4060C9 and #A940C9. In the palettes below you can see it working alongside real color combinations from our collection.

Copy HEX Copy RGB Copy HSL Download PNG swatch SVG

Color values

RGB & CMYK percentages

Red 39% · Green 25% · Blue 79%

Cyan 50% · Magenta 69% · Yellow 0% · Key 21%

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

Previews

CSS code for #643FC9

.text { color: #643FC9; }
.background { background-color: #643FC9; }
.border { border: 3px solid #643FC9; }
.text-rgb { color: rgb(100, 63, 201); }
.text-hsl { color: hsl(256, 56%, 52%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #643FC9; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(100, 63, 201, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #643FC9; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(100, 63, 201, 0.8); }

HTML: <p style="color:#643FC9">Text here</p> · <div style="background-color:#643FC9">Div content here</div>

Shades of #643FC9

Tints of #643FC9

Tones of #643FC9

Color harmonies

Complementary — #A5C940:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #643FC9: #FFFFFF.

Semi-transparent (opacity) text on #643FC9

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 #643FC9 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 #643FC9 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

← #643FC8  ·  #643FCA →

Frequently asked questions

What color is #643FC9?

#643FC9 is Purple, a purple color (RGB 100, 63, 201). Its closest standard named color is SlateBlue.

What is the RGB and HSL of #643FC9?

#643FC9 is RGB 100, 63, 201 — HSL 256°, 56%, 52% — CMYK 50%, 69%, 0%, 21%.

What colors go with #643FC9?

Its complement is #A5C940; analogous partners are #4060C9 and #A940C9. It also appears in 6+ palettes in our collection.

Can I use #643FC9 for text?

White text on #643FC9 has a contrast ratio of 6.78:1 (passes WCAG AA); black text gives 3.10:1.