Color

#fb4737

#fb4737
hex#fb4737
rgbrgb(251, 71, 55)
hslhsl(5, 96%, 60%)
oklchoklch(0.658 0.219 29.3)
Closest name: Blood Burst (#ff474c)Relative luminance 0.2529

Colors that go with #fb4737

Charcoal, Cadet Blue 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 →

#37ebfb

#fb3789 · #fba937

#37fb47 · #4737fb

Split-complementary

Open in tool →

#37fba9 · #3789fb

#89fb37 · #37ebfb · #a937fb

Contrast

#fb4737 as textRatioAAAA largeAAAFix
Aaon white
3.47:1failpassfail
  • AA: use #eb1805 as the text (4.5:1)
  • AAA: use #af1204 as the text (7.21:1)
  • AA: or shift the background to #212121 (4.65:1)
Aaon black
6.06:1passpassfail
  • AAA: use #fc6355 as the text (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #fb4737 as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#fb4737 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #fb4737
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 #fb4737 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/fb4737-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