Color

#404c6d

#404c6d
hex#404c6d
rgbrgb(64, 76, 109)
hslhsl(224, 26%, 34%)
oklchoklch(0.421 0.057 268.5)
Closest name: Bonne Nuit (#3a4866)Relative luminance 0.0736

Colors that go with #404c6d

Steel Blue, Blue and Cadet Blue 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 →

#6d6140

#40636d · #4b406d

#6d404c · #4c6d40

Split-complementary

Open in tool →

#6d4b40 · #636d40

#6d4063 · #6d6140 · #406d4b

Contrast

#404c6d as textRatioAAAA largeAAAFix
Aaon white
8.49:1passpasspassPasses AAA — no fix needed.
Aaon black
2.47:1failfailfail
  • AA: use #6273a3 as the text (4.5:1)
  • AAA: use #8895b9 as the text (7.05:1)
  • AA: or shift the background to #bdbdbd (4.52:1)
  • AAA: or shift the background to #ebebeb (7.12:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #404c6d as the background.

Brands using this color

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

mcpConnect your agent — build around #404c6d
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 #404c6d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/404c6d-9ca2c4-df724e-221f2d-e9eff1?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