Color

#040b8f

#040b8f
hex#040b8f
rgbrgb(4, 11, 143)
hslhsl(237, 95%, 29%)
oklchoklch(0.303 0.197 265.1)
Closest name: darkblue (#00008b)Relative luminance 0.0225

Tints & shades

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

Harmonies

Complementary

Open in tool →

#908904

#045190 · #430490

#90040b · #0b9004

Split-complementary

Open in tool →

#904304 · #519004

#900451 · #908904 · #049043

Contrast

#040b8f as textRatioAAAA largeAAAFix
Aaon white
14.49:1passpasspassPasses AAA — no fix needed.
Aaon black
1.45:1failfailfail
  • AA: use #5b63fb as the text (4.62:1)
  • AAA: use #888dfc as the text (7.26:1)
  • AA: or shift the background to #919191 (4.6:1)
  • AAA: or shift the background to #b5b5b5 (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #040b8f as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#040b8f reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #040b8f
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 #040b8f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/040b8f-9f9cc4-df924e-251f2d-e9edf1?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