Color

#0d403a

#0d403a
hex#0d403a
rgbrgb(13, 64, 58)
hslhsl(173, 66%, 15%)
oklchoklch(0.337 0.053 183.6)
Closest name: Botanical Night (#12403c)Relative luminance 0.0406

Colors that go with #0d403a

Sea Green, Teal and Amber 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 →

#3f0d13

#0d3f20 · #0d2c3f

#3a0d3f · #3f3a0d

Split-complementary

Open in tool →

#3f0d2c · #3f200d

#200d3f · #3f0d13 · #2c3f0d

Contrast

#0d403a as textRatioAAAA largeAAAFix
Aaon white
11.59:1passpasspassPasses AAA — no fix needed.
Aaon black
1.81:1failfailfail
  • AA: use #1b8377 as the text (4.56:1)
  • AAA: use #23a99a as the text (7.21:1)
  • AA: or shift the background to #a3a3a3 (4.6:1)
  • AAA: or shift the background to #c9c9c9 (7:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0d403a as the background.

Brands using this color

Fonts for this mood

#0d403a reads as vivid, dark, luxury. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0d403a
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 #0d403a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0d403a-a2bebe-d459a3-1f292d-e9f1ec?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