Color
#66658b
#66658brgb(102, 101, 139)hsl(242, 16%, 47%)oklch(0.523 0.059 285.4)Colors that go with #66658b
Charcoal, Sea 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 #66658b: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #66658b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #66658b in 6 real palettes, including Lemon Squeezy's brand system and McDonald's's brand system, as the lead colour.
Champagne #f7e7ce
shipped6 real palettes, including BrandSweets's brand system and Darkroom put Champagne beside #66658b.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #66658b: 6 real palettes, including Fintech Trust and Ink & Paper, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #66658b: 4 real palettes, including Dusk and Riverbed, as the accent.
Crimson #dc143c
shippedCrimson is paired with #66658b in 14 real palettes, including Retro Pop and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #66658b: 11 real palettes, including Campus and The New York Times's brand system, as the lead colour.
Real palettes that use #66658b
Tints & shades
Harmonies
Contrast
| #66658b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.53:1 | pass | pass | fail |
|
Aaon black | 3.8:1 | 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 #66658b 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 #66658b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/66658b-a29cc4-df9e4e-261f2d-e9edf1?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