Color

#646b1f

#646b1f
hex#646b1f
rgbrgb(100, 107, 31)
hslhsl(66, 55%, 27%)
oklchoklch(0.506 0.098 114.5)
Closest name: darkolivegreen (#556b2f)Relative luminance 0.1332

Colors that go with #646b1f

Charcoal, Royal Blue and Blue Violet 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.

Real palettes that use #646b1f

Tints & shades

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

Harmonies

Complementary

Open in tool →

#271f6b

#6b4c1f · #3d6b1f

#1f636b · #6b1f63

Split-complementary

Open in tool →

#1f3d6b · #4c1f6b

#1f6b4c · #271f6b · #6b1f3d

Contrast

#646b1f as textRatioAAAA largeAAAFix
Aaon white
5.73:1passpassfail
  • AAA: use #545b1a as the text (7.27:1)
Aaon black
3.66:1failpassfail
  • AA: use #727b24 as the text (4.57:1)
  • AAA: use #939e2e as the text (7.17:1)
  • AA: or shift the background to #e6e6e6 (4.59:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #646b1f 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

#646b1f reads as dark, luxury, bold. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #646b1f
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 #646b1f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/646b1f-b8bea2-4e86df-262d1f-f1eee9?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