brandsweets

Color

#e51519

#e51519
hex#e51519
rgbrgb(229, 21, 25)
hslhsl(359, 83%, 49%)
oklchoklch(0.585 0.231 28)
Closest name: Alarm (#ec0003)Relative luminance 0.1726
WarmVividPlayfulBold
Open in palette toolCheck contrastWhat goes with it ↓

Colors that go with #e51519

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.

Real palettes that use #e51519

Netflix· brandNintendo· brandWWE· brandVodafone· brand

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →
e5151915e5e1

#15e5e1

Analogous

Open in tool →
e51519e51580e57915

#e51580 · #e57915

Triadic

Open in tool →
e5151919e5151519e5

#19e515 · #1519e5

Split-complementary

Open in tool →
e5151915e5791580e5

#15e579 · #1580e5

Tetradic

Open in tool →
e5151980e51515e5e17915e5

#80e515 · #15e5e1 · #7915e5

Contrast

#e51519 as textRatioAAAA largeAAAFix
Aaon white
4.72:1passpassfail
  • AAA: use #b11013 as the text (7.11:1)
Aaon black
4.45:1failpassfail
  • AA: use #e91619 as the text (4.59:1)
  • AAA: use #f16a6c as the text (7.02:1)
  • AA: or shift the background to #fafafa (4.52:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #e51519 as the background.

Brands using this color

Fonts for this mood

#e51519 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

Warm fonts →Playful fonts →Bold fonts →
mcpConnect your agent — build around #e51519
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 #e51519 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/e51519-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