Color

#81091b

#81091b
hex#81091b
rgbrgb(129, 9, 27)
hslhsl(351, 87%, 27%)
oklchoklch(0.385 0.149 22.3)
Closest name: Bloodthirsty (#880011)Relative luminance 0.0494

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#09816f

#810957 · #813309

#1b8109 · #091b81

Split-complementary

Open in tool →

#098133 · #095781

#578109 · #09816f · #330981

Contrast

#81091b as textRatioAAAA largeAAAFix
Aaon white
10.56:1passpasspassPasses AAA — no fix needed.
Aaon black
1.99:1failfailfail
  • AA: use #ea1031 as the text (4.62:1)
  • AAA: use #f4667c as the text (7.04:1)
  • AA: or shift the background to #ababab (4.6:1)
  • AAA: or shift the background to #d4d4d4 (7.13:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #81091b 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

#81091b reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #81091b
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #81091b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/81091b-c49c9e-62cb89-2d231f-f1e9ee?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md