Color

#281d3f

#281d3f
hex#281d3f
rgbrgb(40, 29, 63)
hslhsl(259, 37%, 18%)
oklchoklch(0.262 0.063 296.8)
Closest name: Midnight Velvet (#2a2243)Relative luminance 0.0169

Colors that go with #281d3f

Charcoal, Dark Olive Green and Sea Green 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 →

#343f1d

#1d233f · #391d3f

#3f281d · #1d3f28

Split-complementary

Open in tool →

#3f391d · #233f1d

#3f1d23 · #343f1d · #1d3f39

Contrast

#281d3f as textRatioAAAA largeAAAFix
Aaon white
15.7:1passpasspassPasses AAA — no fix needed.
Aaon black
1.34:1failfailfail
  • AA: use #8269ba as the text (4.68:1)
  • AAA: use #9f8cca as the text (7.08:1)
  • AA: or shift the background to #8a8a8a (4.55:1)
  • AAA: or shift the background to #b0b0b0 (7.24:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #281d3f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#281d3f reads as cool, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #281d3f
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 #281d3f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/281d3f-ad9cc4-dfc74e-2a1f2d-e9ebf1?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