Color

#040f2a

#040f2a
hex#040f2a
rgbrgb(4, 15, 42)
hslhsl(223, 83%, 9%)
oklchoklch(0.177 0.058 263)
Closest name: Mysterious Depths (#060929)Relative luminance 0.0053

Tints & shades

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

Harmonies

Complementary

Open in tool →

#2a1f04

#04222a · #0c042a

#2a040f · #0f2a04

Split-complementary

Open in tool →

#2a0c04 · #222a04

#2a0422 · #2a1f04 · #042a0c

Contrast

#040f2a as textRatioAAAA largeAAAFix
Aaon white
18.97:1passpasspassPasses AAA — no fix needed.
Aaon black
1.11:1failfailfail
  • AA: use #3b6ded as the text (4.6:1)
  • AAA: use #6e94f2 as the text (7.18:1)
  • AA: or shift the background to #7d7d7d (4.61:1)
  • AAA: or shift the background to #9e9e9e (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 #040f2a as the background.

Brands using this color

Fonts for this mood

#040f2a reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #040f2a
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 #040f2a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/040f2a-9ca3c4-df704e-211f2d-e9eff1?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