Color
#666b8f
#666b8frgb(102, 107, 143)hsl(233, 17%, 48%)oklch(0.538 0.057 278.2)Colors that go with #666b8f
Charcoal, Dark Olive Green and Amber 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 #666b8f: softer than #000 and cool enough to feel like part of the same palette.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #666b8f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #666b8f in 5 real palettes, including Lemon Squeezy's brand system and Beach Hut, as the lead colour.
Champagne #f7e7ce
shipped6 real palettes, including Midnight Luxe and BrandSweets's brand system put Champagne beside #666b8f, as that palette's text colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #666b8f: 6 real palettes, including Fintech Trust and Ink & Paper, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #666b8f: 5 real palettes, including Dusk and Riverbed, as the accent.
Crimson #dc143c
shippedCrimson is paired with #666b8f in 10 real palettes, including Retro Pop and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #666b8f: 9 real palettes, including Campus and The New York Times's brand system, as the lead colour.
Real palettes that use #666b8f
Tints & shades
Harmonies
Contrast
| #666b8f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.17:1 | pass | pass | fail |
|
Aaon black | 4.06:1 | 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 #666b8f 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 #666b8f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/666b8f-9c9cc4-df884e-241f2d-e9eef1?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