Color

#643c68

#643c68
hex#643c68
rgbrgb(100, 60, 104)
hslhsl(295, 27%, 32%)
oklchoklch(0.421 0.086 323.7)
Closest name: Plum (#66386a)Relative luminance 0.0694

Colors that go with #643c68

Powder Blue, Royal 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.

Real palettes that use #643c68

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#3f683c

#4e3c68 · #683c55

#68643c · #3c6864

Split-complementary

Open in tool →

#55683c · #3c684e

#684e3c · #3f683c · #3c5568

Contrast

#643c68 as textRatioAAAA largeAAAFix
Aaon white
8.79:1passpasspassPasses AAA — no fix needed.
Aaon black
2.39:1failfailfail
  • AA: use #9c5da2 as the text (4.5:1)
  • AAA: use #b687ba as the text (7.16:1)
  • AA: or shift the background to #bababa (4.53:1)
  • AAA: or shift the background to #e6e6e6 (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #643c68 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

mcpConnect your agent — build around #643c68
live endpoint

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.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #643c68 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/643c68-c19fbf-9dcb62-2d1f28-ede9f1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md