Color

#a8180b

#a8180b
hex#a8180b
rgbrgb(168, 24, 11)
hslhsl(5, 88%, 35%)
oklchoklch(0.469 0.179 30.1)
Closest name: Blood Rush (#aa2222)Relative luminance 0.09

Colors that go with #a8180b

Royal Blue, Teal and Amber 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.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#0b9ba8

#a80b4c · #a8660b

#0ba818 · #180ba8

Split-complementary

Open in tool →

#0ba866 · #0b4ca8

#4ca80b · #0b9ba8 · #660ba8

Contrast

#a8180b as textRatioAAAA largeAAAFix
Aaon white
7.5:1passpasspassPasses AAA — no fix needed.
Aaon black
2.8:1failfailfail
  • AA: use #e6210f as the text (4.59:1)
  • AAA: use #f5695c as the text (7.06:1)
  • AA: or shift the background to #c9c9c9 (4.53:1)
  • AAA: or shift the background to #fafafa (7.18:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #a8180b as the background.

Brands using this color

Fonts for this mood

#a8180b reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #a8180b
live endpoint

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.

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

analyze #a8180b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/a8180b-c4a49c-62cba1-2d261f-f1e9ec?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