Color

#1b643b

#1b643b
hex#1b643b
rgbrgb(27, 100, 59)
hslhsl(146, 57%, 25%)
oklchoklch(0.448 0.098 154.3)
Closest name: Bucolic (#1b6634)Relative luminance 0.0966

Colors that go with #1b643b

Charcoal, Royal Blue and Medium Violet Red 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 #1b643b

Tints & shades

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

Harmonies

Complementary

Open in tool →

#641b45

#20641b · #1b645f

#3b1b64 · #643b1b

Split-complementary

Open in tool →

#5f1b64 · #641b20

#1b2064 · #641b45 · #645f1b

Contrast

#1b643b as textRatioAAAA largeAAAFix
Aaon white
7.16:1passpasspassPasses AAA — no fix needed.
Aaon black
2.93:1failfailfail
  • AA: use #258850 as the text (4.72:1)
  • AAA: use #2fac65 as the text (7.21:1)
  • AA: or shift the background to #cfcfcf (4.6:1)
  • AAA: or shift the background to #ffffff (7.16:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1b643b as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#1b643b reads as dark, luxury, bold. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1b643b
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 #1b643b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1b643b-a2beb1-ce59d4-1f2d2b-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