Color

#de2121

#de2121
hex#de2121
rgbrgb(222, 33, 33)
hslhsl(0, 74%, 50%)
oklchoklch(0.578 0.22 27.7)
Closest name: Angry Tomato (#d82029)Relative luminance 0.1673

Colors that go with #de2121

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 →

#21dede

#de2180 · #de8021

#21de21 · #2121de

Split-complementary

Open in tool →

#21de80 · #2180de

#80de21 · #21dede · #8021de

Contrast

#de2121 as textRatioAAAA largeAAAFix
Aaon white
4.83:1passpassfail
  • AAA: use #ad1a1a as the text (7.14:1)
Aaon black
4.35:1failpassfail
  • AA: use #df2a2a as the text (4.5:1)
  • AAA: use #ea7171 as the text (7.1:1)
  • AA: or shift the background to #f7f7f7 (4.51:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #de2121 as the background.

Brands using this color

Fonts for this mood

#de2121 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #de2121
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 #de2121 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/de2121-c4a19c-62cb98-2d251f-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