Color

#e21216

#e21216
hex#e21216
rgbrgb(226, 18, 22)
hslhsl(359, 85%, 48%)
oklchoklch(0.578 0.23 28.2)
Closest name: Alarm (#ec0003)Relative luminance 0.1666

Colors that go with #e21216

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 →

#12e2df

#e2127e · #e27712

#16e212 · #1216e2

Split-complementary

Open in tool →

#12e277 · #127ee2

#7ee212 · #12e2df · #7712e2

Contrast

#e21216 as textRatioAAAA largeAAAFix
Aaon white
4.85:1passpassfail
  • AAA: use #b30f11 as the text (7.02:1)
Aaon black
4.33:1failpassfail
  • AA: use #e71316 as the text (4.5:1)
  • AAA: use #f36d6f as the text (7.23:1)
  • AA: or shift the background to #f7f7f7 (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 #e21216 as the background.

Brands using this color

Fonts for this mood

#e21216 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #e21216
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 #e21216 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/e21216-c4a09c-62cb96-2d251f-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