brandsweets

Color

#e51520

#e51520
hex#e51520
rgbrgb(229, 21, 32)
hslhsl(357, 83%, 49%)
oklchoklch(0.585 0.231 27)
Closest name: Alarm (#ec0003)Relative luminance 0.173
WarmVividPlayfulBold
Open in palette toolCheck contrastWhat goes with it ↓

Colors that go with #e51520

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 #e51520

Netflix· brandNintendo· brandPinterest· brandPizza Hut· brand

Tints & shades

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

Harmonies

Complementary

Open in tool →
e5152015e5da

#15e5da

Analogous

Open in tool →
e51520e51587e57315

#e51587 · #e57315

Triadic

Open in tool →
e5152020e5151520e5

#20e515 · #1520e5

Split-complementary

Open in tool →
e5152015e5731587e5

#15e573 · #1587e5

Tetradic

Open in tool →
e5152087e51515e5da7315e5

#87e515 · #15e5da · #7315e5

Contrast

#e51520 as textRatioAAAA largeAAAFix
Aaon white
4.71:1passpassfail
  • AAA: use #b11019 as the text (7.1:1)
Aaon black
4.46:1failpassfail
  • AA: use #e91620 as the text (4.6:1)
  • AAA: use #f16a70 as the text (7.04:1)
  • AA: or shift the background to #fafafa (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 #e51520 as the background.

Brands using this color

Fonts for this mood

#e51520 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 #e51520
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 #e51520 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/e51520-c49f9c-62cb93-2d251f-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