Color

#03389b

#03389b
hex#03389b
rgbrgb(3, 56, 155)
hslhsl(219, 96%, 31%)
oklchoklch(0.383 0.169 261.8)
Closest name: Blue Hour (#0034ab)Relative luminance 0.0521

Tints & shades

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

Harmonies

Complementary

Open in tool →

#9b6603

#03849b · #1a039b

#9b0338 · #389b03

Split-complementary

Open in tool →

#9b1a03 · #849b03

#9b0384 · #9b6603 · #039b1a

Contrast

#03389b as textRatioAAAA largeAAAFix
Aaon white
10.28:1passpasspassPasses AAA — no fix needed.
Aaon black
2.04:1failfailfail
  • AA: use #1e6bfa as the text (4.54:1)
  • AAA: use #5a93fc as the text (7.01:1)
  • AA: or shift the background to #adadad (4.58:1)
  • AAA: or shift the background to #d6d6d6 (7.07:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #03389b 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

#03389b reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #03389b
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 #03389b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/03389b-9ca5c4-df664e-211f2d-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