Color

#311b2f

#311b2f
hex#311b2f
rgbrgb(49, 27, 47)
hslhsl(305, 29%, 15%)
oklchoklch(0.26 0.048 330.1)
Closest name: Nightly Voyager (#391531)Relative luminance 0.0164

Colors that go with #311b2f

Charcoal, Dark Olive Green and Sea Green lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#1b311d

#281b31 · #311b24

#2f311b · #1b2f31

Split-complementary

Open in tool →

#24311b · #1b3128

#31281b · #1b311d · #1b2431

Contrast

#311b2f as textRatioAAAA largeAAAFix
Aaon white
15.81:1passpasspassPasses AAA — no fix needed.
Aaon black
1.33:1failfailfail
  • AA: use #a45b9e as the text (4.57:1)
  • AAA: use #bc85b7 as the text (7.18:1)
  • AA: or shift the background to #8a8a8a (4.58:1)
  • AAA: or shift the background to #adadad (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 #311b2f as the background.

Brands using this color

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

Palettes built around it

Fonts for this mood

#311b2f reads as warm, muted, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #311b2f
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

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

›analyze #311b2f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/311b2f-c19fba-8ccb62-2d1f26-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