Color

#51001b

#51001b
hex#51001b
rgbrgb(81, 0, 27)
hslhsl(340, 100%, 16%)
oklchoklch(0.278 0.111 10.5)
Closest name: What We Do in the Shadows (#441122)Relative luminance 0.0183

Tints & shades

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

Harmonies

Complementary

Open in tool →

#005236

#520044 · #520e00

#1b5200 · #001b52

Split-complementary

Open in tool →

#00520e · #004452

#445200 · #005236 · #0e0052

Contrast

#51001b as textRatioAAAA largeAAAFix
Aaon white
15.38:1passpasspassPasses AAA — no fix needed.
Aaon black
1.37:1failfailfail
  • AA: use #eb004e as the text (4.64:1)
  • AAA: use #ff578f as the text (7.01:1)
  • AA: or shift the background to #8c8c8c (4.57:1)
  • AAA: or shift the background to #b0b0b0 (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #51001b 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

#51001b reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #51001b
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 #51001b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/51001b-c49ca5-62cb75-2d211f-f1e9f0?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