Color

#81031f

#81031f
hex#81031f
rgbrgb(129, 3, 31)
hslhsl(347, 95%, 26%)
oklchoklch(0.383 0.152 19.6)
Closest name: Bloodthirsty (#880011)Relative luminance 0.0483

Tints & shades

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

Harmonies

Complementary

Open in tool →

#038166

#81035e · #812703

#1f8103 · #031f81

Split-complementary

Open in tool →

#038127 · #035e81

#5e8103 · #038166 · #270381

Contrast

#81031f as textRatioAAAA largeAAAFix
Aaon white
10.68:1passpasspassPasses AAA — no fix needed.
Aaon black
1.97:1failfailfail
  • AA: use #ea0637 as the text (4.58:1)
  • AAA: use #fb6081 as the text (7.09:1)
  • AA: or shift the background to #ababab (4.65:1)
  • AAA: or shift the background to #d4d4d4 (7.21:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #81031f 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

#81031f reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #81031f
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 #81031f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/81031f-c49ca0-62cb82-2d221f-f1e9ef?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