Color

#281b31

#281b31
hex#281b31
rgbrgb(40, 27, 49)
hslhsl(275, 29%, 15%)
oklchoklch(0.249 0.044 310.6)
Closest name: Black Velvet (#222233)Relative luminance 0.0146

Tints & shades

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

Harmonies

Complementary

Open in tool →

#24311b

#1d1b31 · #311b2f

#31281b · #1b3128

Split-complementary

Open in tool →

#2f311b · #1b311d

#311d1b · #24311b · #1b2f31

Contrast

#281b31 as textRatioAAAA largeAAAFix
Aaon white
16.26:1passpasspassPasses AAA — no fix needed.
Aaon black
1.29:1failfailfail
  • AA: use #8d64aa as the text (4.54:1)
  • AAA: use #aa8cc0 as the text (7.22:1)
  • AA: or shift the background to #878787 (4.53:1)
  • AAA: or shift the background to #ababab (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #281b31 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

#281b31 reads as cool, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #281b31
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 #281b31 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/281b31-b89cc4-c0cb62-2d1f2d-eae9f1?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