Color

#f21826

#f21826
hex#f21826
rgbrgb(242, 24, 38)
hslhsl(356, 89%, 52%)
oklchoklch(0.611 0.24 26.5)
Closest name: Assassin’s Red (#f60206)Relative luminance 0.1967

Colors that go with #f21826

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 →

#18f2e3

#f21893 · #f27618

#26f218 · #1826f2

Split-complementary

Open in tool →

#18f276 · #1893f2

#93f218 · #18f2e3 · #7618f2

Contrast

#f21826 as textRatioAAAA largeAAAFix
Aaon white
4.26:1failpassfail
  • AA: use #ec0e1d as the text (4.52:1)
  • AAA: use #b20a16 as the text (7.12:1)
  • AA: or shift the background to #0f0f0f (4.5:1)
Aaon black
4.93:1passpassfail
  • AAA: use #f6656e as the text (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #f21826 as the background.

Brands using this color

Fonts for this mood

#f21826 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #f21826
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 #f21826 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/f21826-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