Color
#646c78
#646c78rgb(100, 108, 120)hsl(216, 9%, 43%)oklch(0.529 0.021 258.4)Colors that go with #646c78
Charcoal, Amber and Champagne 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 that reads cleanly against #646c78 without the hard edge of pure #000.
Amber #ffbf00
shippedAmber is paired with #646c78 in 4 real palettes, including Beach Hut and Lemon Squeezy's brand system, as the supporting colour.
Champagne #f7e7ce
shipped7 real palettes, including BrandSweets's brand system and Forest Floor put Champagne beside #646c78.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #646c78: 5 real palettes, including Ink & Paper and Fintech Trust, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #646c78: 7 real palettes, including Riverbed and Dusk, as the accent.
Crimson #dc143c
shippedCrimson is paired with #646c78 in 8 real palettes, including Retro Pop and Gemstone, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #646c78: 11 real palettes, including Campus and The New York Times's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #646c78: 5 real palettes, including Newsprint and Wendy's's brand system, as the lead colour.
Real palettes that use #646c78
Tints & shades
Harmonies
Contrast
| #646c78 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.31:1 | pass | pass | fail |
|
Aaon black | 3.96:1 | 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 #646c78 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
#646c78 reads as muted, minimal. 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 #646c78 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/646c78-9ca7c4-df5f4e-201f2d-e9f0f1?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