Color
#666bcc
#666bccrgb(102, 107, 204)hsl(237, 50%, 60%)oklch(0.571 0.147 278.4)Colors that go with #666bcc
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 #666bcc: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #666bcc — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #666bcc in 9 real palettes, including Wikipedia's brand system and Warner Bros.'s brand system, as the accent.
Blue #0000ff
shipped12 real palettes, including Qualcomm's brand system and Pixar's brand system put Blue beside #666bcc, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #666bcc: 10 real palettes, including Intel's brand system and Carrefour's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #666bcc: 6 real palettes, including Coca-Cola's brand system and Mastodon hosted on mastodon.social's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #666bcc in 13 real palettes, including Marvel's brand system and Netflix's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #666bcc: 6 real palettes, including Calm's brand system and Astro's brand system, as the lead colour.
Real palettes that use #666bcc
Tints & shades
Harmonies
Contrast
| #666bcc as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.63:1 | pass | pass | fail |
|
Aaon black | 4.54:1 | pass | 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 #666bcc as the background.
Brands using this color
Fonts for this mood
#666bcc 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 #666bcc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/666bcc-9f9cc4-df924e-251f2d-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