Color

#b2010a

#b2010a
hex#b2010a
rgbrgb(178, 1, 10)
hslhsl(357, 99%, 35%)
oklchoklch(0.48 0.196 28.1)
Closest name: All Systems Red (#b30103)Relative luminance 0.0951

Colors that go with #b2010a

Teal, Goldenrod and Slate Gray 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 #b2010a

Tints & shades

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

Harmonies

Complementary

Open in tool →

#01b2a9

#b20162 · #b25001

#0ab201 · #010ab2

Split-complementary

Open in tool →

#01b250 · #0162b2

#62b201 · #01b2a9 · #5001b2

Contrast

#b2010a as textRatioAAAA largeAAAFix
Aaon white
7.24:1passpasspassPasses AAA — no fix needed.
Aaon black
2.9:1failfailfail
  • AA: use #ef010d as the text (4.68:1)
  • AAA: use #fe626a as the text (7.17:1)
  • AA: or shift the background to #cccccc (4.51:1)
  • AAA: or shift the background to #fcfcfc (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b2010a as the background.

Brands using this color

Fonts for this mood

#b2010a reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #b2010a
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 #b2010a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b2010a-c49f9c-62cb93-2d251f-f1e9ed?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