Color
#643f97
#643f97rgb(100, 63, 151)hsl(265, 41%, 42%)oklch(0.455 0.14 300.3)Colors that go with #643f97
Charcoal, Royal Blue and Blue 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 #643f97: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #643f97's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped5 real palettes, including Zillow's brand system and Pixar's brand system put Blue beside #643f97, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #643f97 in 8 real palettes, including Wells Fargo's brand system and Walgreens's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #643f97: 9 real palettes, including Slack's brand system and Hinge's brand system, as the lead colour.
Midnight Blue #191970
shipped12 real palettes, including Kraken's brand system and First Snow put Midnight Blue beside #643f97, as the lead colour.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #643f97: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Taupe #483c32
shippedTaupe is paired with #643f97 in 5 real palettes, including Datadog's brand system and Superhuman's brand system, as that palette's text colour.
Real palettes that use #643f97
Tints & shades
Harmonies
Contrast
| #643f97 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.78:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.7:1 | 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 #643f97 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
#643f97 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 #643f97 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/643f97-b19cc4-dfd54e-2b1f2d-e9eaf1?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