Color

#aa0909

#aa0909
hex#aa0909
rgbrgb(170, 9, 9)
hslhsl(0, 90%, 35%)
oklchoklch(0.467 0.187 28.7)
Closest name: All Systems Red (#b30103)Relative luminance 0.0876

Tints & shades

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

Harmonies

Complementary

Open in tool →

#09aaaa

#aa0959 · #aa5909

#09aa09 · #0909aa

Split-complementary

Open in tool →

#09aa59 · #0959aa

#59aa09 · #09aaaa · #5909aa

Contrast

#aa0909 as textRatioAAAA largeAAAFix
Aaon white
7.63:1passpasspassPasses AAA — no fix needed.
Aaon black
2.75:1failfailfail
  • AA: use #e90c0c as the text (4.52:1)
  • AAA: use #f76969 as the text (7.18:1)
  • AA: or shift the background to #c7c7c7 (4.51:1)
  • AAA: or shift the background to #f7f7f7 (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #aa0909 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#aa0909 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #aa0909
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #aa0909 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/aa0909-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