Color

#bb3e1b

#bb3e1b
hex#bb3e1b
rgbrgb(187, 62, 27)
hslhsl(13, 75%, 42%)
oklchoklch(0.539 0.167 35.7)
Closest name: Rust (#b7410e)Relative luminance 0.1409

Colors that go with #bb3e1b

Royal Blue, Sea Green and Steel 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.

Real palettes that use #bb3e1b

Tints & shades

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

Harmonies

Complementary

Open in tool →

#1b99bb

#bb1b48 · #bb8e1b

#1bbb3e · #3e1bbb

Split-complementary

Open in tool →

#1bbb8e · #1b48bb

#48bb1b · #1b99bb · #8e1bbb

Contrast

#bb3e1b as textRatioAAAA largeAAAFix
Aaon white
5.5:1passpassfail
  • AAA: use #9c3316 as the text (7.24:1)
Aaon black
3.82:1failpassfail
  • AA: use #d2451e as the text (4.61:1)
  • AAA: use #e77555 as the text (7.07:1)
  • AA: or shift the background to #ebebeb (4.61:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #bb3e1b as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#bb3e1b reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #bb3e1b
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 #bb3e1b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/bb3e1b-c4a99c-62cbaf-2d281f-f1e9eb?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