Color
#666eb7
#666eb7rgb(102, 110, 183)hsl(234, 36%, 56%)oklch(0.564 0.113 277.4)Colors that go with #666eb7
Charcoal, Medium Sea Green and Midnight 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #666eb7: softer than #000 and cool enough to feel like part of the same palette.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #666eb7 in 4 real palettes, including Fintech Trust and Indigo SaaS, as the accent — a combination designers have actually shipped, not a computed rotation.
Midnight Blue #191970
shippedMidnight Blue is paired with #666eb7 in 5 real palettes, including Plaid's brand system and Fintech Trust, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Orange Red #ff4500
shippedOrange Red is paired with #666eb7 in 4 real palettes, including PlanetScale's brand system and Readymag's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Taupe #483c32
shippedTaupe is paired with #666eb7 in 8 real palettes, including Astro's brand system and Retool's brand system, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Olive Green #808000
complementaryOlive Green sits directly opposite #666eb7 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cadet Blue #5f9ea0
shippedCadet Blue is paired with #666eb7 in 3 real palettes, including Dusk and Open House, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Cobalt Blue #0047ab
shippedCobalt Blue is paired with #666eb7 in 3 real palettes, including Fintech Trust and Glacier, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #666eb7
Tints & shades
Harmonies
Contrast
| #666eb7 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.69:1 | pass | pass | fail |
|
Aaon black | 4.48:1 | 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 #666eb7 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
#666eb7 reads as cool, modern. The font library is tagged with the same vocabulary:
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 #666eb7 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/666eb7-9d9cc4-df8a4e-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