Color

#0d243f

#0d243f
hex#0d243f
rgbrgb(13, 36, 63)
hslhsl(212, 66%, 15%)
oklchoklch(0.258 0.059 254.1)
Closest name: Dark Eclipse (#112244)Relative luminance 0.0171

Colors that go with #0d243f

Charcoal, Sea Green and Sienna 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 →

#3f280d

#0d3e3f · #0f0d3f

#3f0d25 · #253f0d

Split-complementary

Open in tool →

#3f0f0d · #3e3f0d

#3f0d3e · #3f280d · #0d3f0f

Contrast

#0d243f as textRatioAAAA largeAAAFix
Aaon white
15.66:1passpasspassPasses AAA — no fix needed.
Aaon black
1.34:1failfailfail
  • AA: use #2a75cb as the text (4.51:1)
  • AAA: use #5e9ade as the text (7.15:1)
  • AA: or shift the background to #8a8a8a (4.54:1)
  • AAA: or shift the background to #b0b0b0 (7.22:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0d243f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#0d243f reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0d243f
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 #0d243f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0d243f-9caac4-df564e-1f202d-e9f1f1?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