Color

#3f5d64

#3f5d64
hex#3f5d64
rgbrgb(63, 93, 100)
hslhsl(191, 23%, 32%)
oklchoklch(0.458 0.037 213.8)
Closest name: Arctic Nights (#345c61)Relative luminance 0.0981

Colors that go with #3f5d64

Sienna, Blush Pink 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.

Real palettes that use #3f5d64

Tints & shades

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

Harmonies

Complementary

Open in tool →

#64463f

#3f6458 · #3f4b64

#643f5d · #5d643f

Split-complementary

Open in tool →

#643f4b · #64583f

#583f64 · #64463f · #4b643f

Contrast

#3f5d64 as textRatioAAAA largeAAAFix
Aaon white
7.09:1passpasspassPasses AAA — no fix needed.
Aaon black
2.96:1failfailfail
  • AA: use #527b84 as the text (4.53:1)
  • AAA: use #729da7 as the text (7.1:1)
  • AA: or shift the background to #cfcfcf (4.55:1)
  • AAA: or shift the background to #ffffff (7.09:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f5d64 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 #3f5d64
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 #3f5d64 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/3f5d64-a2b6be-df4e7a-1f252d-e9f1ef?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