Color

#fb1820

#fb1820
hex#fb1820
rgbrgb(251, 24, 32)
hslhsl(358, 97%, 54%)
oklchoklch(0.627 0.248 27.5)
Closest name: red (#ff0000)Relative luminance 0.2127

Colors that go with #fb1820

Charcoal, Dodger Blue 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.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#18fbf4

#fb1891 · #fb8218

#20fb18 · #1820fb

Split-complementary

Open in tool →

#18fb82 · #1891fb

#91fb18 · #18fbf4 · #8218fb

Contrast

#fb1820 as textRatioAAAA largeAAAFix
Aaon white
4:1failpassfail
  • AA: use #ec040b as the text (4.58:1)
  • AAA: use #b50309 as the text (7.04:1)
  • AA: or shift the background to #141414 (4.61:1)
Aaon black
5.25:1passpassfail
  • AAA: use #fd6368 as the text (7.16:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #fb1820 as the background.

Brands using this color

Fonts for this mood

#fb1820 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #fb1820
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 #fb1820 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/fb1820-c49f9c-62cb95-2d251f-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