Color

#37011b

#37011b
hex#37011b
rgbrgb(55, 1, 27)
hslhsl(331, 96%, 11%)
oklchoklch(0.221 0.088 357.3)
Closest name: Vienna Roast (#330022)Relative luminance 0.0091

Tints & shades

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

Harmonies

Complementary

Open in tool →

#01371d

#370136 · #370201

#1b3701 · #011b37

Split-complementary

Open in tool →

#013702 · #013637

#363701 · #01371d · #020137

Contrast

#37011b as textRatioAAAA largeAAAFix
Aaon white
17.76:1passpasspassPasses AAA — no fix needed.
Aaon black
1.18:1failfailfail
  • AA: use #e60572 as the text (4.63:1)
  • AAA: use #fc5aa8 as the text (7.17:1)
  • AA: or shift the background to #828282 (4.62:1)
  • AAA: or shift the background to #a3a3a3 (7.04:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #37011b 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

#37011b reads as warm, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #37011b
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 #37011b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/37011b-c49cab-62cb66-2d1f20-f1e9f1?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