Color

#03438c

#03438c
hex#03438c
rgbrgb(3, 67, 140)
hslhsl(212, 96%, 28%)
oklchoklch(0.394 0.135 256.6)
Closest name: Cascade Twilight (#234893)Relative luminance 0.0593

Colors that go with #03438c

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.

Real palettes that use #03438c

Tints & shades

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

Harmonies

Complementary

Open in tool →

#8c4c03

#03878c · #07038c

#8c0343 · #438c03

Split-complementary

Open in tool →

#8c0703 · #878c03

#8c0387 · #8c4c03 · #038c07

Contrast

#03438c as textRatioAAAA largeAAAFix
Aaon white
9.61:1passpasspassPasses AAA — no fix needed.
Aaon black
2.19:1failfailfail
  • AA: use #0570eb as the text (4.52:1)
  • AAA: use #4198fb as the text (7.11:1)
  • AA: or shift the background to #b3b3b3 (4.58:1)
  • AAA: or shift the background to #dedede (7.14:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #03438c as the background.

Brands using this color

Palettes built around it

Fonts for this mood

#03438c reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #03438c
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 #03438c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/03438c-9caac4-df564e-1f202d-e9f1f1?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