Color

#403a3f

#403a3f
hex#403a3f
rgbrgb(64, 58, 63)
hslhsl(310, 5%, 24%)
oklchoklch(0.356 0.012 331.3)
Closest name: After Midnight (#38393f)Relative luminance 0.0447

Colors that go with #403a3f

Amber, 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 #403a3f

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3a403b

#3e3a40 · #403a3c

#3f403a · #3a3f40

Split-complementary

Open in tool →

#3c403a · #3a403e

#403e3a · #3a403b · #3a3c40

Contrast

#403a3f as textRatioAAAA largeAAAFix
Aaon white
11.08:1passpasspassPasses AAA — no fix needed.
Aaon black
1.89:1failfailfail
  • AA: use #7e727c as the text (4.59:1)
  • AAA: use #9e949c as the text (7.17:1)
  • AA: or shift the background to #a6a6a6 (4.55:1)
  • AAA: or shift the background to #cfcfcf (7.11:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #403a3f 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

#403a3f reads as neutral, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #403a3f
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 #403a3f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/403a3f-a2beb0-c859d4-1f2d2b-eaf1e9?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