Color

#04388b

#04388b
hex#04388b
rgbrgb(4, 56, 139)
hslhsl(217, 94%, 28%)
oklchoklch(0.368 0.147 260.4)
Closest name: Deep Space Royal (#223382)Relative luminance 0.0472

Colors that go with #04388b

Charcoal, Crimson and Steel Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#8b5704

#047b8b · #14048b

#8b0438 · #388b04

Split-complementary

Open in tool →

#8b1404 · #7b8b04

#8b047b · #8b5704 · #048b14

Contrast

#04388b as textRatioAAAA largeAAAFix
Aaon white
10.8:1passpasspassPasses AAA — no fix needed.
Aaon black
1.94:1failfailfail
  • AA: use #166df8 as the text (4.58:1)
  • AAA: use #5795fa as the text (7.08:1)
  • AA: or shift the background to #a8a8a8 (4.54:1)
  • AAA: or shift the background to #d1d1d1 (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 #04388b as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#04388b reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #04388b
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #04388b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/04388b-9ca7c4-df624e-201f2d-e9f0f1?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