Color

#04578b

#04578b
hex#04578b
rgbrgb(4, 87, 139)
hslhsl(203, 94%, 28%)
oklchoklch(0.442 0.11 245.2)
Closest name: Beyond the Sea (#005784)Relative luminance 0.0871

Tints & shades

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

Harmonies

Complementary

Open in tool →

#8b3804

#048b7b · #04148b

#8b0457 · #578b04

Split-complementary

Open in tool →

#8b0414 · #8b7b04

#7b048b · #8b3804 · #148b04

Contrast

#04578b as textRatioAAAA largeAAAFix
Aaon white
7.66:1passpasspassPasses AAA — no fix needed.
Aaon black
2.74:1failfailfail
  • AA: use #0679c1 as the text (4.51:1)
  • AAA: use #089bf7 as the text (7.04:1)
  • AA: or shift the background to #c7c7c7 (4.53:1)
  • AAA: or shift the background to #f5f5f5 (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #04578b 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

#04578b reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #04578b
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 #04578b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/04578b-9cb0c4-df4e5d-1f222d-e9f1f0?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