Color

#e40110

#e40110
hex#e40110
rgbrgb(228, 1, 16)
hslhsl(356, 99%, 45%)
oklchoklch(0.578 0.236 28.1)
Closest name: Alarm (#ec0003)Relative luminance 0.1655

Colors that go with #e40110

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 →

#01e4d5

#e40182 · #e46401

#10e401 · #0110e4

Split-complementary

Open in tool →

#01e464 · #0182e4

#82e401 · #01e4d5 · #6401e4

Contrast

#e40110 as textRatioAAAA largeAAAFix
Aaon white
4.87:1passpassfail
  • AAA: use #b2010d as the text (7.23:1)
Aaon black
4.31:1failpassfail
  • AA: use #ef0111 as the text (4.68:1)
  • AAA: use #fe626c as the text (7.18:1)
  • AA: or shift the background to #f7f7f7 (4.55:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #e40110 as the background.

Brands using this color

Fonts for this mood

#e40110 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #e40110
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 #e40110 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/e40110-c49e9c-62cb91-2d241f-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