Color

#668ca9

#668ca9
hex#668ca9
rgbrgb(102, 140, 169)
hslhsl(206, 28%, 53%)
oklchoklch(0.623 0.061 241.8)
Closest name: lightslategray (#778899)Relative luminance 0.2445

Colors that go with #668ca9

Charcoal, Copper and Cobalt 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.

Real palettes that use #668ca9

Tints & shades

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

Harmonies

Complementary

Open in tool →

#a98366

#66a9a4 · #666aa9

#a9668c · #8ca966

Split-complementary

Open in tool →

#a9666a · #a9a466

#a466a9 · #a98366 · #6aa966

Contrast

#668ca9 as textRatioAAAA largeAAAFix
Aaon white
3.57:1failpassfail
  • AA: use #547a96 as the text (4.56:1)
  • AAA: use #3e5a6f as the text (7.25:1)
  • AA: or shift the background to #212121 (4.52:1)
Aaon black
5.89:1passpassfail
  • AAA: use #799ab4 as the text (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #668ca9 as the background.

Brands using this color

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

Palettes built around it

mcpConnect your agent — build around #668ca9
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 #668ca9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/668ca9-9caec4-df4e56-1f212d-e9f1f1?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