Color
#665c99
#665c99rgb(102, 92, 153)hsl(250, 25%, 48%)oklch(0.511 0.095 290.1)Colors that go with #665c99
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 #665c99: 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 #665c99: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #665c99 in 5 real palettes, including Warner Bros.'s brand system and McDonald's's brand system, as the accent.
Blue #0000ff
shipped4 real palettes, including Pixar's brand system and Activision's brand system put Blue beside #665c99, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #665c99: 7 real palettes, including Fintech Trust and Ink & Paper, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #665c99 in 14 real palettes, including Marvel's brand system and Wells Fargo's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #665c99: 4 real palettes, including Venmo's brand system and Astro's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #665c99: 7 real palettes, including Campbell's's brand system and Honda's brand system, as the supporting colour.
Real palettes that use #665c99
Tints & shades
Harmonies
Contrast
| #665c99 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.91:1 | pass | pass | fail |
|
Aaon black | 3.56:1 | 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 #665c99 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 #665c99 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/665c99-a79cc4-dfb14e-281f2d-e9ecf1?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