Color
#666d54
#666d54rgb(102, 109, 84)hsl(77, 13%, 38%)oklch(0.521 0.039 120.5)Colors that go with #666d54
Charcoal, Slate Blue and Champagne 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 body-text near-black for #666d54: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Slate Blue #6a5acd
complementaryshippedSlate Blue sits directly opposite #666d54 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Champagne #f7e7ce
shipped6 real palettes, including Forest Floor and BrandSweets's brand system put Champagne beside #666d54, as that palette's text colour.
Copper #b87333
shippedDesigners have shipped Copper with #666d54: 7 real palettes, including Clay & Linen and Riverbed, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #666d54 in 6 real palettes, including Five Guys's brand system and Netflix's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #666d54: 7 real palettes, including Intel's brand system and Jack Daniel's's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #666d54: 4 real palettes, including Newsprint and Fireside, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #666d54 in 6 real palettes, including Harvest and Mid-Century, as the accent.
Real palettes that use #666d54
Tints & shades
Harmonies
Contrast
| #666d54 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.41:1 | pass | pass | fail |
|
Aaon black | 3.88:1 | fail | pass | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #666d54 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #666d54 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/666d54-b3bea2-4e6bdf-232d1f-f1efe9?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