Color

#040a2a

#040a2a
hex#040a2a
rgbrgb(4, 10, 42)
hslhsl(231, 83%, 9%)
oklchoklch(0.164 0.066 267.9)
Closest name: Mysterious Depths (#060929)Relative luminance 0.0041

Tints & shades

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

Harmonies

Complementary

Open in tool →

#2a2404

#041d2a · #11042a

#2a040a · #0a2a04

Split-complementary

Open in tool →

#2a1104 · #1d2a04

#2a041d · #2a2404 · #042a11

Contrast

#040a2a as textRatioAAAA largeAAAFix
Aaon white
19.41:1passpasspassPasses AAA — no fix needed.
Aaon black
1.08:1failfailfail
  • AA: use #526aef as the text (4.67:1)
  • AAA: use #7c8ef3 as the text (7.02:1)
  • AA: or shift the background to #7a7a7a (4.52:1)
  • AAA: or shift the background to #9c9c9c (7.07:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #040a2a as the background.

Brands using this color

Fonts for this mood

#040a2a reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #040a2a
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 #040a2a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/040a2a-9c9ec4-df834e-231f2d-e9eef1?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