Undergrowth
Open in tool →Fern and lichen with a fungus orange on a fir-black — the forest floor at dusk, as a dark theme.
Color
#51664d
#51664d
hex
#51664drgb
rgb(81, 102, 77)hsl
hsl(110, 14%, 35%)oklch
oklch(0.486 0.047 140.6)Closest name: Black Forest (#5e6354)Relative luminance 0.1179
Colors that go with #51664d
Charcoal, Slate Blue and Cadet 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 body-text near-black for #51664d: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Slate Blue #6a5acd
complementaryshippedSlate Blue sits directly opposite #51664d on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #51664d: 4 real palettes, including Alpine and Paper & Pine, as the supporting colour.
Champagne #f7e7ce
shipped5 real palettes, including BrandSweets's brand system and Darkroom put Champagne beside #51664d.
Copper #b87333
shippedDesigners have shipped Copper with #51664d: 6 real palettes, including Clay & Linen and Desert Road, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #51664d in 6 real palettes, including Gemstone and Five Guys's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #51664d: 8 real palettes, including Intel's brand system and Jack Daniel's's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #51664d in 5 real palettes, including Fireside and Mid-Century, as the accent.
Real palettes that use #51664d
Tints & shades
Harmonies
Contrast
| #51664d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.25:1 | pass | pass | fail |
|
Aaon black | 3.36:1 | 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 #51664d as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
mcpConnect your agent — build around #51664d
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #51664d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/51664d-a3bea2-814edf-1f2d23-eef1e9?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