Color

#b1101e

#b1101e
hex#b1101e
rgbrgb(177, 16, 30)
hslhsl(355, 83%, 38%)
oklchoklch(0.484 0.189 25.4)
Closest name: All Systems Red (#b30103)Relative luminance 0.0981

Colors that go with #b1101e

Royal Blue, Steel Blue and Teal 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 →

#10b1a4

#b1106e · #b15310

#1eb110 · #101eb1

Split-complementary

Open in tool →

#10b153 · #106eb1

#6eb110 · #10b1a4 · #5310b1

Contrast

#b1101e as textRatioAAAA largeAAAFix
Aaon white
7.09:1passpasspassPasses AAA — no fix needed.
Aaon black
2.96:1failfailfail
  • AA: use #e91627 as the text (4.61:1)
  • AAA: use #f16a75 as the text (7.06:1)
  • AA: or shift the background to #cfcfcf (4.55:1)
  • AAA: or shift the background to #ffffff (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b1101e as the background.

Brands using this color

Fonts for this mood

#b1101e reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #b1101e
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 #b1101e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b1101e-c49e9c-62cb8f-2d241f-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