Color

#040558

#040558
hex#040558
rgbrgb(4, 5, 88)
hslhsl(239, 91%, 18%)
oklchoklch(0.218 0.137 266.6)
Closest name: Ravenclaw (#0a0555)Relative luminance 0.0084

Tints & shades

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

Harmonies

Complementary

Open in tool →

#585604

#042f58 · #2d0458

#580406 · #065804

Split-complementary

Open in tool →

#582d04 · #2f5804

#58042f · #585604 · #04582d

Contrast

#040558 as textRatioAAAA largeAAAFix
Aaon white
17.98:1passpasspassPasses AAA — no fix needed.
Aaon black
1.17:1failfailfail
  • AA: use #5e61f7 as the text (4.53:1)
  • AAA: use #8a8cf9 as the text (7.2:1)
  • AA: or shift the background to #808080 (4.55:1)
  • AAA: or shift the background to #a3a3a3 (7.13:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #040558 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

#040558 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #040558
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 #040558 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/040558-a09cc4-df964e-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