Color

#0d283f

#0d283f
hex#0d283f
rgbrgb(13, 40, 63)
hslhsl(208, 66%, 15%)
oklchoklch(0.269 0.054 247.3)
Closest name: Eternal Darkness (#1c2841)Relative luminance 0.0196

Tints & shades

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

Harmonies

Complementary

Open in tool →

#3f250d

#0d3f3e · #0d0f3f

#3f0d28 · #283f0d

Split-complementary

Open in tool →

#3f0d0f · #3f3e0d

#3e0d3f · #3f250d · #0f3f0d

Contrast

#0d283f as textRatioAAAA largeAAAFix
Aaon white
15.08:1passpasspassPasses AAA — no fix needed.
Aaon black
1.39:1failfailfail
  • AA: use #2778be as the text (4.52:1)
  • AAA: use #519bdb as the text (7.06:1)
  • AA: or shift the background to #8f8f8f (4.66:1)
  • AAA: or shift the background to #b3b3b3 (7.19:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0d283f as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#0d283f reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #0d283f
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #0d283f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/0d283f-9cadc4-df4e51-1f212d-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