Color
#646ca0
#646ca0rgb(100, 108, 160)hsl(232, 24%, 51%)oklch(0.546 0.082 276.6)Colors that go with #646ca0
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 #646ca0: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #646ca0 — 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 #646ca0 in 8 real palettes, including Lemon Squeezy's brand system and McDonald's's brand system, as the lead colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #646ca0: 7 real palettes, including Fintech Trust and Glacier, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #646ca0: 4 real palettes, including Dusk and Riverbed, as the accent.
Crimson #dc143c
shippedCrimson is paired with #646ca0 in 15 real palettes, including Marvel's brand system and Retro Pop, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #646ca0: 5 real palettes, including Astro's brand system and Deep Water, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #646ca0: 13 real palettes, including Campus and The New York Times's brand system, as the lead colour.
Real palettes that use #646ca0
Tints & shades
Harmonies
Contrast
| #646ca0 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.01:1 | pass | pass | fail |
|
Aaon black | 4.19:1 | 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 #646ca0 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 #646ca0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/646ca0-9c9dc4-df864e-231f2d-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