Color

#21302f

#21302f
hex#21302f
rgbrgb(33, 48, 47)
hslhsl(176, 19%, 16%)
oklchoklch(0.295 0.02 191)
Closest name: Nightmare Fuel (#293135)Relative luminance 0.0264

Colors that go with #21302f

Amber, Blue and Blue Violet 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 →

#312122

#213128 · #212a31

#302131 · #313021

Split-complementary

Open in tool →

#31212a · #312821

#282131 · #312122 · #2a3121

Contrast

#21302f as textRatioAAAA largeAAAFix
Aaon white
13.74:1passpasspassPasses AAA — no fix needed.
Aaon black
1.53:1failfailfail
  • AA: use #557c7a as the text (4.55:1)
  • AAA: use #709e9b as the text (7.05:1)
  • AA: or shift the background to #949494 (4.53:1)
  • AAA: or shift the background to #bababa (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #21302f 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

Fonts for this mood

#21302f reads as muted, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #21302f
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 #21302f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/21302f-a2bdbe-d4599d-1f282d-e9f1ed?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