Color

#660559

#660559
hex#660559
rgbrgb(102, 5, 89)
hslhsl(308, 91%, 21%)
oklchoklch(0.352 0.152 335.2)
Closest name: Cosmic Explorer (#551155)Relative luminance 0.0365

Colors that go with #660559

Sea Green, Teal and Olive Green 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 #660559

Tints & shades

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

Harmonies

Complementary

Open in tool →

#056612

#430566 · #660529

#596605 · #055966

Split-complementary

Open in tool →

#296605 · #056643

#664305 · #056612 · #052966

Contrast

#660559 as textRatioAAAA largeAAAFix
Aaon white
12.13:1passpasspassPasses AAA — no fix needed.
Aaon black
1.73:1failfailfail
  • AA: use #d60abb as the text (4.62:1)
  • AAA: use #f74be0 as the text (7.04:1)
  • AA: or shift the background to #9e9e9e (4.53:1)
  • AAA: or shift the background to #c7c7c7 (7.18:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #660559 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

#660559 reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #660559
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 #660559 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/660559-c19fb8-87cb62-2d1f25-eee9f1?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