Color

#646e4e

#646e4e
hex#646e4e
rgbrgb(100, 110, 78)
hslhsl(79, 17%, 37%)
oklchoklch(0.521 0.05 122.2)
Closest name: Bancha (#666a47)Relative luminance 0.1441

Colors that go with #646e4e

Charcoal, Slate Blue and Blush Pink 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 #646e4e

Tints & shades

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

Harmonies

Complementary

Open in tool →

#584e6e

#6e694e · #546e4e

#4e646e · #6e4e64

Split-complementary

Open in tool →

#4e546e · #694e6e

#4e6e69 · #584e6e · #6e4e54

Contrast

#646e4e as textRatioAAAA largeAAAFix
Aaon white
5.41:1passpassfail
  • AAA: use #545c42 as the text (7.03:1)
Aaon black
3.88:1failpassfail
  • AA: use #6f7a57 as the text (4.6:1)
  • AAA: use #8f9c73 as the text (7.17:1)
  • AA: or shift the background to #ebebeb (4.54:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #646e4e 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

mcpConnect your agent — build around #646e4e
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 #646e4e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/646e4e-b2bea2-4e66df-232d1f-f1f0e9?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