Color

#240521

#240521
hex#240521
rgbrgb(36, 5, 33)
hslhsl(306, 76%, 8%)
oklchoklch(0.19 0.068 331.9)
Closest name: Black Sabbath (#220022)Relative luminance 0.0059

Tints & shades

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

Harmonies

Complementary

Open in tool →

#052408

#180524 · #240511

#212405 · #052124

Split-complementary

Open in tool →

#112405 · #052418

#241805 · #052408 · #051124

Contrast

#240521 as textRatioAAAA largeAAAFix
Aaon white
18.77:1passpasspassPasses AAA — no fix needed.
Aaon black
1.12:1failfailfail
  • AA: use #ce1cbd as the text (4.53:1)
  • AAA: use #e95ddb as the text (7.05:1)
  • AA: or shift the background to #7d7d7d (4.56:1)
  • AAA: or shift the background to #9e9e9e (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 #240521 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

#240521 reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #240521
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 #240521 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/240521-c19fb9-8acb62-2d1f26-eee9f1?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