Color

#e30d31

#e30d31
hex#e30d31
rgbrgb(227, 13, 49)
hslhsl(350, 89%, 47%)
oklchoklch(0.581 0.23 23.1)
Closest name: crimson (#dc143c)Relative luminance 0.1684

Colors that go with #e30d31

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 →

#0de3bf

#e30d9b · #e3540d

#31e30d · #0d31e3

Split-complementary

Open in tool →

#0de354 · #0d9be3

#9be30d · #0de3bf · #540de3

Contrast

#e30d31 as textRatioAAAA largeAAAFix
Aaon white
4.81:1passpassfail
  • AAA: use #b20a26 as the text (7.08:1)
Aaon black
4.37:1failpassfail
  • AA: use #e70d32 as the text (4.5:1)
  • AAA: use #f6657d as the text (7.08:1)
  • AA: or shift the background to #fafafa (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 #e30d31 as the background.

Brands using this color

Fonts for this mood

#e30d31 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #e30d31
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 #e30d31 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/e30d31-c49c9e-62cb87-2d231f-f1e9ee?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