Color
#51656c
#51656crgb(81, 101, 108)hsl(196, 14%, 37%)oklch(0.493 0.027 221.1)Colors that go with #51656c
Charcoal, Champagne and Cobalt 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 that reads cleanly against #51656c without the hard edge of pure #000.
Champagne #f7e7ce
shipped5 real palettes, including Darkroom and BrandSweets's brand system put Champagne beside #51656c, as the surface under it.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #51656c: 4 real palettes, including Ink & Paper and Fintech Trust, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #51656c: 5 real palettes, including Desert Road and Dusk, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #51656c in 8 real palettes, including Gemstone and Retro Pop, as the accent.
Dark Goldenrod #b8860b
shipped4 real palettes, including Cider and Greige put Dark Goldenrod beside #51656c, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #51656c: 12 real palettes, including HP's brand system and The New York Times's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #51656c: 5 real palettes, including Fireside and Newsprint, as the lead colour.
Real palettes that use #51656c
Tints & shades
Harmonies
Contrast
| #51656c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.13:1 | pass | pass | fail |
|
Aaon black | 3.43:1 | 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 #51656c as the background.
Brands using this color
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 #51656c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51656c-9cb5c4-df4e6e-1f232d-e9f1ef?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