Color
#643b81
#643b81rgb(100, 59, 129)hsl(275, 37%, 37%)oklch(0.434 0.118 309.4)Colors that go with #643b81
Charcoal, Midnight Blue and Taupe lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #643b81: softer than #000 and cool enough to feel like part of the same palette.
Midnight Blue #191970
shipped4 real palettes, including First Snow and Microsoft's brand system put Midnight Blue beside #643b81, as that palette's text colour.
Taupe #483c32
shippedTaupe is paired with #643b81 in 4 real palettes, including Datadog's brand system and Superhuman's brand system, as that palette's text colour.
Dark Olive Green #556b2f
complementaryDark Olive Green sits directly opposite #643b81 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Denim #1560bd
shippedDesigners have shipped Denim with #643b81: 3 real palettes, including Hinge's brand system and Slack's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #643b81 in 3 real palettes, including Wayfair's brand system and Console Light, as the supporting colour.
Tomato #ff6347
shipped3 real palettes, including Golden Hour and Harley-Davidson's brand system put Tomato beside #643b81, as the supporting colour.
Teal #008080
triadicshippedTeal completes a triad with #643b81 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #643b81
Tints & shades
Harmonies
Contrast
| #643b81 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.45:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.48:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #643b81 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#643b81 reads as cool, modern. The font library is tagged with the same vocabulary:
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #643b81 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/643b81-b89cc4-c0cb62-2d1f2d-eae9f1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md