Color

#3a373f

#3a373f
hex#3a373f
rgbrgb(58, 55, 63)
hslhsl(263, 7%, 23%)
oklchoklch(0.343 0.014 302.7)
Closest name: After Midnight (#38393f)Relative luminance 0.0399

Colors that go with #3a373f

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.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3c3f37

#37383f · #3e373f

#3f3a37 · #373f3a

Split-complementary

Open in tool →

#3f3e37 · #383f37

#3f3738 · #3c3f37 · #373f3e

Contrast

#3a373f as textRatioAAAA largeAAAFix
Aaon white
11.68:1passpasspassPasses AAA — no fix needed.
Aaon black
1.8:1failfailfail
  • AA: use #787283 as the text (4.53:1)
  • AAA: use #9a95a3 as the text (7.2:1)
  • AA: or shift the background to #a1a1a1 (4.52:1)
  • AAA: or shift the background to #c9c9c9 (7.05:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3a373f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#3a373f reads as neutral, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #3a373f
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 #3a373f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3a373f-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