Color

#d5151f

#d5151f
hex#d5151f
rgbrgb(213, 21, 31)
hslhsl(357, 82%, 46%)
oklchoklch(0.555 0.218 26.8)
Closest name: Angry Tomato (#d82029)Relative luminance 0.1478

Colors that go with #d5151f

Charcoal, Royal 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 →

#15d5cc

#d5157f · #d56c15

#1fd515 · #151fd5

Split-complementary

Open in tool →

#15d56c · #157fd5

#7fd515 · #15d5cc · #6c15d5

Contrast

#d5151f as textRatioAAAA largeAAAFix
Aaon white
5.31:1passpassfail
  • AAA: use #b01119 as the text (7.14:1)
Aaon black
3.96:1failpassfail
  • AA: use #e81721 as the text (4.58:1)
  • AAA: use #f06a71 as the text (7.01:1)
  • AA: or shift the background to #ededed (4.53:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #d5151f as the background.

Brands using this color

Fonts for this mood

#d5151f reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #d5151f
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 #d5151f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/d5151f-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