Color

#ef1524

#ef1524
hex#ef1524
rgbrgb(239, 21, 36)
hslhsl(356, 87%, 51%)
oklchoklch(0.604 0.239 26.5)
Closest name: Barberry (#ee1133)Relative luminance 0.1901

Colors that go with #ef1524

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 →

#15efe0

#ef1591 · #ef7415

#24ef15 · #1524ef

Split-complementary

Open in tool →

#15ef74 · #1591ef

#91ef15 · #15efe0 · #7415ef

Contrast

#ef1524 as textRatioAAAA largeAAAFix
Aaon white
4.37:1failpassfail
  • AA: use #ea101f as the text (4.57:1)
  • AAA: use #b00c17 as the text (7.21:1)
  • AA: or shift the background to #0a0a0a (4.53:1)
Aaon black
4.8:1passpassfail
  • AAA: use #f56b74 as the text (7.24:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #ef1524 as the background.

Brands using this color

Fonts for this mood

#ef1524 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #ef1524
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 #ef1524 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/ef1524-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